The long sit-up is an advanced version of the sit-up exercise that is performed with the hands reaching over the head. This lengthens the torso, making it harder for the abs to contract and lift the upper body. Long sit-ups can be performed for time or for reps, with the feet anchored or free.
Activates and strengthens the abs, in particular the rectus abdominis or “six-pack” muscles
Strengthens the hip flexors in addition to abs
Simple way to progress sit-ups when they become easy to do for high reps