Place a stability ball between your lower back and a wall while holding a dumbbell in each hand at your sides. Step your feet slightly forward and shoulder-width apart. Keep your chest up and core engaged as you slowly lower into a squat, allowing the ball to roll up and down the wall with your movement. Descend until your thighs are at least parallel to the floor, then drive through your heels to return to the starting position while maintaining constant pressure into the ball.
Log your weighted exercise ball wall squat sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.