Home Health-Fitness Flatten your belly, slim your thighs, and firm your butt in 2 weeks– without a single sit-up or squat. These five ballet-inspired moves use one piece of equipment youre sure to have in your home–a wall to gently increase your flexibility and range of motion. The result: Youll isolate the tough to reach muscles that pull in your belly, lift your backside, and trim your thighs..