Lie on your back with knees bent and feet flat on the floor. Extend your arms straight overhead. Engage your core and lift your torso up toward your knees, keeping your arms extended above you. Pause briefly at the top with your chest upright, then lower back down with control to the starting position.
Log your arms overhead full sit up sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.