flexion leg sit up (straight arm)
A waist exercise targeting the abs, performed with body weight.
How to do flexion leg sit up (straight arm)
Lie flat on your back with your legs extended and arms straight above your head.
Engaging your abs, lift your upper body off the ground while simultaneously lifting your legs towards your chest.
Reach your hands towards your toes as you lift your upper body and legs.
Pause for a moment at the top, then slowly lower your upper body and legs back down to the starting position.
Repeat for the desired number of repetitions.
Muscles worked
Primary (target)
Secondary
Related exercises
Track flexion leg sit up (straight arm) in NutriMind
Log your sets and the app does the rest — automatic PR detection, progression charts for every lift, and progressive overload that adjusts your next workout. Paired with AI nutrition coaching so your training and your plate pull in the same direction.
Planning your next heavy session? Estimate your max with the One Rep Max Calculator and build up to it with the Warm-up Calculator. More free tools →