TETSUFlexion Leg Sit Up (Bent Knee)
The Flexion Leg Sit Up (Bent Knee) is a bodyweight exercise for the core that primarily targets the abs, with the hip flexors assisting. Follow the 6 steps below for correct form, with an animated demonstration.
How to do the Flexion Leg Sit Up (Bent Knee)
- Lie flat on your back with your knees bent and feet flat on the ground.
- Place your hands behind your head with your elbows pointing outwards.
- Engaging your abs, slowly lift your upper body off the ground, curling forward until your torso is at a 45-degree angle.
- At the same time, lift your legs off the ground, bending your knees and bringing them towards your chest.
- 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.
Common questions
What muscles does the Flexion Leg Sit Up (Bent Knee) work?
The Flexion Leg Sit Up (Bent Knee) primarily targets the abs. The hip flexors work as supporting muscles.
What equipment do I need for the Flexion Leg Sit Up (Bent Knee)?
None. The Flexion Leg Sit Up (Bent Knee) uses your body weight only, so you can do it anywhere.
How many sets and reps of the Flexion Leg Sit Up (Bent Knee) should I do?
3 to 4 sets of 10 to 15 controlled reps of the Flexion Leg Sit Up (Bent Knee) suits most programs — smaller muscle groups respond well to moderate loads and strict form. Progress by adding reps first, then small weight increments.
Track it in Tetsu
Log your sets, see your core volume climb, and let AI plan your week. Scan the code or grab the app — free to start.