Weiss felt her body slowly unfold, her body aching from the torment she had just experienced. As soon as her mouth began to reform, she flashed a smile.
As bad as things were, she couldn't get stepped on from this point. A feeling of safety shone on her, watching someone drop a candy bar near her. This was still risky, and gross, but it beat the floor. 
Her smile faded, as she saw Nora aiming a plastic bottle towards the tinies direction.
"Wait-" Weiss gulped, realising how close to the edge she was. She was painfully aware of how many people were walking past. The worst part was, she wasn't hearing the floof sound of a mat, she was hearing the loud thuds of someone walking on wood. Weiss struggled to reform as Nora wound up her shot, "Nora- no!" Weiss paniced, knowing her luck all too well as the bottle flew towards her, smacking her tiny form off the bin and onto the floor.
"Woosh! Nothing but net!" Nora called out, grinning as Weiss was quickly crushed underfoot.
Yang didn't even feel Weiss get obliterated under her meaty heel. The tiny sticker girl quickly joining the other junk that had attached to the powerhouses foot. Weiss wrythed in pain as she was put under the worst pressure she had ever experienced. The heel of Yang's foot had been the bane of her existance on the mats, easily being one of the heaviest experiences she had the displeasure to experience. Now, on the wooden floor, with no mat to protect her, the pressure was unfathomably worse.
She could do nothing but whimper as she lifted up with Yangs foot with no sign of unsticking as the giant girl slammed her into the floor again and again without blinking.
Yang hopped onto the mats, not hearing Weiss's complaints as she lead with the heel Weiss was on. The conversation above that Yang was having was drowned out by the tons of flesh, followed by the sound of the foot sticking to the mat. Weiss felt her eyes shake with the power of every step as she slowly felt a thin layer of dirt cover her back. It was the first time she wished she would stick to the mat again, even if she would be further away from her friends and less likely to be found.
Thankfully, when Yang stopped she rested her weight on her other foot, raising the foot Weiss was on as she rested on the ball of that foot. Weiss inhaled the heavy scent of foot for a moment, before exhaling, barely getting a look at the busy gym as she attempted to look behind her. The tiny ones body unable to so much as twitch as her unknowing torturer spoke.
"...I think I'm going to do some weight lifting today- I did way too much cardio yesterday!" Yang announced, "Need to keep it up ready for the gun show, aw yeah-" She spoke happily, Weiss could only assume Yang gave a little pose to show off her strength.
"I can go for some dumbells-" Blake nodded, out of view of Weiss. 
"Haha, I'm going to beat my squat record!" The buxom blonde called out, not noticing Weiss's renewed struggles as she stomped down into a powerful pose- planting her feet firmly.
Weiss didn't even notice the painful stomped over the mats. Her brain was blank as she struggled to process what was happening. Weight lifting, Yang was known for being the strongest in the group. How much extra pressure was that going to be? The tiny girl didn't even attempt to struggle as fear over came her. She didn't fully notice how long Yangs foot had been staying still until the pressure began to build up. Weiss quickly tried to bite, to scratch, to scram but it was no use.
Bearing some warmup weights on her shoulders, Yang exhaled as she went down. No one paid attention to the girls heel sinking slightly deeper into the mat as she pushed down on the mat to lift the weight up, bouncing slightly only to come back down.
"One, two, three, four, five, six, seven, eight, nine, ten" Yang counted, not breaking a sweat as she easily put the weight back. It always felt weird using light weights, but it was important to build up to lifting something heavy. She wandered around, stretching as she wandered around, waiting for Blake to do her set.
As Yang wandered, the demolished smear under her foot twitched. That was the worst weight she had ever experience, the shier will and fear of going through that again gave Weiss some tiny amount of movement between footfalls- but it was no use, she was far too stuck.
Blake finished her set just as easily, before helping Yang lift the heavier weights onto the bar. Weiss screamed all the way as Yangs foot constantly steam rolled over her every time she stood up with a weight. Weiss was frantic now as Yang took her position. The tiny knew it was impossible to avoid, but she found some comfort in the vent. She squinted her eyes shut in preperation as the weight increased. Heavier and heavier, obliterating all thought as she just lay under Yang with a silent cry.
"One" Yang spoke, easily going down and up. Weiss feeling the momentum of the dip. "Two" Yang yawned slightly, finding it still far too easy. "Three-"
It felt like an eternity before Yang put the weight back. She wandered away again, letting Blake use it. It was light enough for Blake to keep up at this point. This time, there was no struggle from Weiss. When the foot rose up, a paper thin faded mark could be made out. Anyone with super hearing who had their ear to Yangs heel might beable to hear the deflated noise of Weiss as she struggled to understand what was happening. The only thought in her head was that she wanted to be free.
Yang set a few more weights up with Blake after Blake had finished her reps. She quickly got in position once again, as usual she didn't notice Weiss's struggles as she rolled the weight onto her back.
Blake, noticing almost everything about her friends breathing, the small amount of sweat on her friends head, the look of ease on Yangs face, almost every detail was taken in without effort by Blake. Her perceptive eyes always taking in more detain then most, however, not even the perceptive Blake bothered to notice how deep Yangs foot sank into the mat each rep. She only took note a few times as Yangs foot slid into a better position, planting itself down in her well practiced lifting technique. 
No one imagined the friction that caused, or the torment that was happening as Yang slowed down with the heavier weight set.
"Oooone-" Yang smiled, finally getting into the heavier sets. "Twooooo" She straighted, making sure her back was bent over backwards to avoid spine injury . "Threee-" She ajusted her feet, barely noticing how much harder it was to slide over the mat with the additional weight. "Fouuuur, Fiiiiive, Siiiiiix, Seeeeven, Eiiiiight, Niiiiine aaaaaaaand Ten!" Yang chirped, popping the weight off.
Yang hopped away from the weight towards her water bottle, her feet plopping heavily on the floor. If you scraped some of the dirt away you might see a small discolouration on her foot where Weiss's obliterated form was.
It didn't take long before Blake finished her set, helping Yang put on a lot more weight. This was where the two decided to split their training, Yang doing 3 reps, 3 sets on this heavier weight while Blake stuck with doing 10 reps for 3 sets on the previous weight.
Weiss could do nothing as Yang got back into position. Planting her feet firmly on the ground, Yang had no idea what she was about to do as she rolled the weight onto her shoulders with a more serious face. Her feet sank deeper then ever as she exhaled, her voice barely strained as she dipped down. Her heels raised slightly before slamming back on the ground to push herself upwards.
"Oooooooone" Yang started.
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Yang grunted, dropping the bar on the ground with exaustion,
"S-sorry to keep you weighting...?" Yang choaked out a pun, having spent a good while slowly struggling to get her last set in with Blake spotting her. Blake just rolled her eyes,
"Sure sure, nice job on breaking your record" she announced. Yang grinned, weakly slapping Blakes ass before wandering towards the changing room. "Do you need to slap my ass every session-?" the cat winced,
"Every session- it's tradition now-" Yang panted in response.
No trace of Weiss remained. The silent foot continued on without hassle, unaware of the demolished girl still attached as Yang wandered over to her shoes. With no trace, Weiss was utterly helpless and unable to get anyones attention after experiencing the worst hell imaginable. Her eyes widened slightly as Yang slid her bare foot into a well worn sneaker- vowing to shower when she gets back.