Rachel - Splits Training (Patreon)

 Hours on end of core training always precede Rachel's balance exercises. Amy knows that after thoroughly exhausting her workout-slave's abs, the effort it takes to twitch and twist and balance is near torture. Add to that weights, intricate moves and poses and before long, even Rachel's flexible, powerful body is trembling constantly.

 But she continues with a grin, carrying out every single command and ready to burn her muscles more for Mistress Amy.