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The Sit-Up is an abdominal exercise that specifically trains the rectus abdominis muscles.
Lie flat on your back and place your feet on the ground while bending your knees.
Hold a weight plate or a dumbbell behind your head firmly.
Exhale and slowly raise your upper body off the ground, pushing the weight up while tensing your abdominal muscles.
Inhale and slowly lower your upper body back down, moving the weight back behind you.
