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An Energized Workout

By Cimmaron Spirit

Commission for Xilimyth

WARNING: This story contains: cheetah, nudity, muscle growth, breast growth, no-yiff, F/solo, exercise and more. If it's not your cup of tea, or you aren't 18, then you better go find something else. Otherwise, enjoy!

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Xilimyth hummed to herself as the automatic doors slid open and allowed her to walk into the gym, with the sound of metal clanking on metal, grunts and exclamations of those working out echoing through the couple floors of equipment and machines.

It wasn't very busy this early in the afternoon: most people were at work or busy with their lives, so it was only a handful of people who found this time to be the best for themselves. But that worked fine for Xili, as she flashed her membership card and was waved on by the bored looking attendant at the front desk.

The cheetah had been coming here for a few months now, and the results were starting to show. She is about six feet tall, but very slim and lithe. Fit, but not "big" by any stretch of the word.

Xilimyth continued humming to herself, turning the corner to go to the locker room when she saw a brown furred horse with a rather shortly cut black mane standing at the booth that usually sold drinks, smoothies and other things to customers. Normally it was one of the staff that worked at the booth, but the horse wasn't anyone that the cheetah had seen before. Not to mention that it was labeled with red and grey signs and posters for "N-R-G Supplements," a brand that she had never heard of before. To top it all off, the horse was wearing a grey suit and red tie, which really stood out compared to the usual t-shirts and tank tops that everyone wore in the gym.

"Hello ma'am!" the horse said as he noticed Xili, beaming a smile. "Can I help you?"

"I... uh... just looking," Xilimyth said, politely glancing over the display for the few seconds to at least be polite before carrying on with her day.

"Of course, of course, take your time" the horse said with his salesman smile, waving his hand over the various bottles, snack bars, containers of powder, gels and who knew what else.

"Though I will say that we are offering a free trial of our newest product," the horse said, reaching down and pulling out a liter bottle with the red and grey logo of the brand. "N-R-G Extreme Power Drink! All the protein and electrolytes and other good stuff you need to power your workout with none of the bad stuff that will prevent you from reaching the extreme!"

Xilimyth suppressed a chuckle at the over the top scripted marketing cliches that the horse just had to belt out. But she wasn't going to turn down something that was free, so took the plastic bottle from his hand.

"Thank you very much ma'am! And if you want more, you'll know where to find me!"

The cheetah finally had to let a little snicker out as she turned away. Where do they find those kinds of people to try to sell this stuff?

She walked into the change room and quickly changed into her workout tank top and shorts, before walking out the other door and toward the nearest treadmill, with the free bottle of energy drink in one paw and her phone and earbuds in another.

Xilimyth set up a jogging pace on the treadmill as she put in the white plastic into her ears to listen to her playlist of music and a timer for how long she wanted to run before switching, humming to herself as she padded away. Her genetics made it fairly easy to keep up the pace as she ran on the treadmill, and soon Xilimyth's mind began to wander, thoughts of what to get for supper or work she had to do at home infiltrating her mind.

She grabbed the N-R-G bottle, breaking open the seal on the top and taking a swig of the drink. Xilimyth was actually surprised at the taste: it was a great mixture of fruits, with a bit of a kick to make it that much tastier and more interesting than any other normal energy drink.

"Hmm, maybe I will have to get a couple bottles later," Xili told herself, before continuing with her run on the treadmill.

In fact, she started to feel that she was actually outpacing the treadmill, the speed that she set the machine to go wasn't quite fast enough, she was having to restrict her strides, and she was having to slow herself down. Absentmindedly, Xilimyth tapped the increase speed button a couple of times, until the machine was running at a more suitable speed, and she was able to settle down again...

BEEP BEEP BEEP BEEP!

Xilimyth nearly jumped, as the timer on her phone went off and blasted in her ears, letting her know that she was done.

Reluctantly, Xilimyth paused the music on her phone and tapped the off button on the treadmill, sighing as it slowed down and finally stopped.

"Man, I felt like I was just getting into that," she sighed, taking another swig from the bottle. Her heart rate had gone up a bit, but not as much as she had expected it too, and she felt as energetic as ever.

What she didn't notice was the fact that all the muscles on her body, but especially her legs, looked a bit thicker, a bit more defined than when she walked into the gym, her yellow and brown spotted fur having seemingly expanded and stretched to cover more of her body. The results of weeks of working out, but in just twenty minutes.

Xilimyth headed for the next station in her workout, a rowing machine. She set the weight for about 50 pounds and sat on the sliding seat, then started her reps.

Fifty pounds was about normal for her usually, but today it felt really light much to her surprise. But she didn't think too much about it until after the 20 reps were done, and took another sip of the energy drink. Part of her was telling her bump it up, to go bigger.

So Xili got up and set it for seventy-five, and proceeded to quickly do twenty more.

"That's weird..." the cheetah muttered. "Maybe I was going too easy before?" She got up and bumped it up to a hundred. She felt a bit of resistance at first, but soon even going double the normal weight felt like it wasn't enough. She was feeling more and more pumped, but without any of the tiredness or aches that came with it. In fact, she felt better than ever!

So just as an experiment, she set it for 200 pounds.

No matter who good Xilimyth was feeling, she knew that she may get a couple reps, maybe even five, going four times her regular. She took another drink from the bottle of the N-R-G bottle, and sat down, grabbing the bar, and pulled.

The first few were, indeed, harder and tougher than anything she had done before, but each one felt slightly easier than the one before, until she was suddenly doing a second set, then a third...

Finally, after sixty reps, she let go of the handle, the weights crashing down with a bang, and Xilimyth felt amazing.

"Damn, I feel good!" she said to herself, not even aware of how much bigger her biceps and triceps were, nearly double in size from before. The cheetah's already flat stomach looked a bit more toned, with the first hints of six pack abs where none had been before. Even her back and shoulders seemed wider and thicker, with lots of room to grow yet.

Xilimyth chugged down the rest of the bottle of the N-R-G drink, crushing the plastic in her hand as she got the last drop into her mouth, then threw it at the closest recycle bin, managing to sink the three-point shot with little difficulty.

"I feel really good!" the cheetah grinned. "But I'm going to need another drink."

She marched back toward the booth set up near the change rooms, where the horse was explaining the benefits of one product over another to a well-built black grey wolf, wearing a tight-fitting muscle shirt that showed off his bowling ball shoulders and giant biceps, and shorts that struggled to contain his calves and thighs.

"Either way, you can't go wrong with the N-R-G brand!" the horse said with a grin as the wolf pondered the difference between the two containers of smoothie powder. The sales horse looked up to see Xilimyth. "Ah, back I see. How can I help you?"

"Got any more of those drinks?" Xilimyth asked. The wolf's ears perked and he glanced over his shoulder, and his mouth dropped open at the sight of the rather large cheetah behind him. He had seen her around before over the past few weeks, but he always thought she was rather thin and petite, not the muscular amazon standing there now.

"Ah, of course," the horse said. "However, I can't give you another free sample, sadly. Company policy. But..."

"That's fine. How much for a bottle?"

"Four bucks. I can make a tab if that would be easier."

Xili nodded, and got handed another bottle of the delicious energy drink.

"Thank you! And come again!"

Xilimyth nodded, ignoring the stares from the turned around and headed toward the nearby rack of dumbbells, and exuberantly and self-assuredly grabbed the fifty-pound weights, the largest ones, on the bottom row since she felt so much stronger than usual. She sat down on the bench and proceeded to do a variety of exercises: bicep curls, shoulder presses, lunges, calf raises and the lying dumbbell fly, taking sips of the second free drink in between each set and rep.

But none of them proved to be a challenge: the big, cast iron weights felt like they were only five pounds, not fifty. Xilimyth was actually disappointed at how heavy they weren't, even though it actually was a whole lot heavier than anything she had used just a couple of days ago.

So grumbled, slamming the weights down on the rack in frustration at the apparent lack of progress she noticed.

"These don't feel challenging at all now!" Xili growled, before turning to the nearby bench press, and the stack of iron plates next to it, and letting a grin cross her muzzle.

Before she got started though, she needed to be hydrated. The cheetah pushed the N-R-G bottle against her lips, swallowing the last drops of her second drink.

Xilimyth opened her eyes, surprised at how quickly she had emptied that bottle. Didn't she just get one?

"I should get another one..."

"Here, take mine," the grey wolf from earlier, having just appeared from behind her said, pushing his unopened bottle in her hand.

Xilimyth blinked. "I was going to go pay for one, but thank you, I guess?"

"Anytime. Name's Zack by the way."

"Xilimyth," the cheetah replied, and they shook hands. "I'll get you one later, because these are really good."

"I'll take your word for it," Zack replied with a smile, before pointing to the bench press. "So, need a spotter?"

"Uh, yeah, sure," Xilimyth said, as she grabbed a couple 50-pound plates, setting one on either side of the empty bar.

"So, have to say that you look good. Been working out long?" Zack said, as he walked around to prepare to spot the cheetah, but to his surprise, she went to grab a couple more of the same size plates on either end, putting 200 pounds of iron on the bench.

"On and off," Xilimyth said as she laid down on the bench, wrapping her clawed fingers around the steel bar, adjusting her grip on the bar, taking a deep breath... then pushed up.

There may have been a moment of struggle to get it up, but only for a moment, before Xilimyth began to lower it to her chest, then push it back up, then let it down, over and over until she counted ten reps, and she set it back down and sat up.

"Whoa..." Zack whistled. "Didn't realize you were more than just good looks."

Xilimyth turned around as she took a big drink from her drink, a devious smile on her lips. "Flattery ain't going to get you anywhere, big boy. How much can you lift?"

"Oh, 350, easily," Zack said with a cocky grin, before flexing a bicep, making veins pop from under his fur. "Been working out every day since I was 15 to look like this."

"Show me then," Xili said, climbing off the bench, and sliding a few more 50-pound plates on either side.

Zack got onto the bench, and proceeded to pound out a full set. He did grunt and groan as he did so, growling with each exertion to push the heavy bar up, then let it down without crushing his windpipe, then back up again, before setting it down.

"See? Easy," Zack said, panting, drops of sweat dripping off his brow and broad back.

"Very nice. My turn," Xili said as she took another big swig from the bottle of N-R-G drink.

Zack went to take some plates off, but the cheetah slapped his hand away.

"Let's try this first."

The wolf raised an eyebrow. "It's almost double what you did before. You sure?"

"If I had any issues, I got a big strong wolf to spot me, right?" Xilimyth asked, as she laid down and grabbed the bar.

Zack shrugged his shoulders, getting behind the bench and getting ready to grab the bar before Xili was crushed under the heavy iron.

Xili pushed up. She was a bit taken aback by how heavy it was... but she was able to lift it up, and proceeded to do ten reps.

"Grraaarr!" Xili growled, as she set the bar down, looking up to see the shocked wolf looking down at her. "More weight."

"Wha... you mean..."

Xili grabbed the wolf's shirt and pulled him down. "More. Weight."

Zack swallowed at the domineering cheetah gal, and quickly pulled away, replacing the 25-pound weights on either side with 50s, making it 400 pounds.

Which Xilimyth proceeded to easily lift up and down, down and up, before racking it, grabbing the energy drink beside her and chugging down another third of the bottle.

"More," Xili growled at the wolf.

Zack complied, adding 25s to either side, adding up to 450.

With Xili easily handled.

"More!" Xili howled.

Zack increased the weight to 500, though he was starting to feel a bit intimidated by the cheetah and her strength...

Which Xilimyth proved again, by not only doing a set of 10 reps, but doing 20 instead.

"Give me more!" Xilimyth shouted.

Zack was frozen for a moment as he stared at Xilimyth, but a flash of her fangs and a deep growl made the big muscle wolf jump, ears laying back against his head and tail tucking between his legs. He went straight to 600 pounds.

And except for a short stumble at first and bigger increase in weight than before, Xili completed 20 reps.

"MORE!" Xili bellowed, drinking the last bit of the energy drink in her third bottle.

The wolf meekly slipped a hundred more pounds on. By now even the bar was groaning from the weight, as was the bench.

But Xilimyth didn't notice or care.

"One... two... three..." she counted each rep through gritted teeth.

"Four... five... six... seven..." the cheetah was a powerhouse, easily lifting twice what Zack could, without a drop of sweat or anything marring her yellow and brown spotted fur.

"Eight... nine... ten... eleven..." Xili counted as she went past the reps.

"Uh... Xili..." Zack said...

"TWELVE..." she barked to silence him. "Thirteen... fourteen... fifteen..."

Zack cowered back, watching in shock and awe as the tall, lithe cheetah he thought he had seen a while ago easily overpower him.

Not to mention that he could see the changes coming over her body that he at first tried to warn her about...

"Sixteen... seventeen... eighteen... nineteen..."

Xili felt like every muscle in her body was on fire. It was the most amazing feeling in her life, a pump like none other.

She felt like she could take on anyone. Take on the world!

"TWENTY!" she bellowed, slamming the bar onto the rack with such force that the bar actually cracked in the middle, 350 pounds of iron plates crashing to the floor on either side.

Xili sat up and roared, flexing every muscle in her body...

And then she heard the clothing rip.

The cheetah paused, glancing down, and blinking.

"What... what is..."

She poked at the yellow colored spheres at the bottom of her vision, only to have nerve endings fire. She suddenly realized she was touching her breasts.

But... they were huge!

She had been rather normal sized, maybe even smaller than normal. Enough to maybe cup a breast in a single hand.

Now... now she could barely wrap her arms around her chest. Her boobs had massively increased in size: quintupled maybe? Sextupled?

But not only that, but her arms were bigger. Her biceps now formed mountains that would rival even Zack's.

She sat up, looking at the nearby mirror wall. Her back had almost doubled in size; her stomach was ridged with abdominal muscles, though the top row of her new six pack was hidden by the underside of her breasts. The shorts she was wearing was barely holding together, but looked more like Daisy Duke short-shorts than what she had been wearing before. Her thighs and calves and hips were so much bigger than before.

Even the shoes on her feet had torn apart, her clawed toes poking out the front, her heel having ripped through the back.

"What. The. Hell." Xilimyth muttered, looking at the giant, muscle goddess in the mirror that had the same yellow and brown spots that she knew so well, but stretched and molded in a shape she couldn't recognize. She had to be almost a half foot taller, as well as a couple hundred pounds heavier too, all in muscle.

It was surreal, impossible... and maybe a little bit exciting.

But then in the mirror she noticed something else.

The large crowd that had gathered, stunned and amazed at the growing cheetah.

Xili spun around, making the other gym goers, men and women in various shapes and sizes, recoil in nervousness and shock.

The cheetah blinked, before wrapping her arms around to try to cover her newly enlarged tits, and swallowing. "I... I guess I just had a good workout, eh?"

"Y-yeah, I'll say," Zack said, pulling off his shirt and handing it to the half naked cheetah, who tried to cover her chest. "Uh... I will go see if they have anything in... your... size."

Xilimyth nodded, standing up and walking toward the change room. The crowd parted as she slowly walked past, trying to make sure her already tight shorts didn't give out until she could at least be out of public eye.

At the front of the gym, leaning against the booth he was working out, Cimmaron let out a little chuckle at the commotion around Xilimyth, and her retreat into the locker rooms.

The cellphone in his pocket rang, and he fished it out, looking at the caller ID.

The brown furred stallion with the short cropped black mane tapped the button, and lifted it to his ear.

"Part One is complete," the horse in the suit said into the phone to whoever was on the other end of the line. "Permission to begin Part Two?"

There was a pause as Cimmaron listened.

"Of course. We'll give the subject a chance to get used to their new size. Then we can begin Part Two."

The horse hung up the phone and put it back in his pocket, before slipping out of the gym, pulling out a golden pocket watch... then vanishing into an orange colored portal.

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