Stand on a BOSU balance trainer and hold a light weight or extend your arms forward for counterbalance. Shift your weight onto one leg and lower into a single-leg squat by bending at the knee and hip while maintaining balance on the unstable surface. Keep your torso steady and descend with control, then drive through the heel of the working leg to stand back up, engaging the quads, glutes, and core throughout.
Log your bosu ball balance counterbalanced skater squat sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.