Lie flat on your back with knees bent and feet on the floor, holding a medicine ball at chest level. Lower the ball toward your chest, then explosively push it upward and throw it as high as possible. Catch the ball with soft elbows and control it back to your chest before repeating, keeping your core tight throughout.
Log your medicine ball supine chest throw sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.