Lie on your back with knees bent and feet flat on the floor. Extend your arms by your sides and lift your shoulders slightly off the ground. Reach your right hand toward your right heel, then return to center and reach your left hand toward your left heel, alternating sides in a controlled motion while keeping your core engaged.
Log your alternate heel touchers waist fix max sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.