Exercise guide
Open And Knee Tuck On A Padded Stool
- Beginner
- Compound
- Rep-based
- Waist
This core-focused movement targets the entire abdominal wall and hip flexors by combining a seated crunch with leg extension. It improves trunk stability and lower-body control using the stool as a pivot point for a full range of motion.
Reviewed by the Crucible team · Updated June 2026
Muscles worked
Setup
- Sit on the edge of the padded stool with your hands gripping the sides just behind your hips for support.
- Lean your torso back slightly to a 45-degree angle while lifting your feet off the floor.
- Bring your knees toward your chest to find your balance in the starting tuck position.
How to do it
- Inhale and slowly extend your legs straight out in front of you while leaning your torso back further to open the body into a V-shape.
- Exhale and pull your knees back toward your chest, simultaneously crunching your upper body forward to meet them.
- Maintain a controlled tempo, spending 2 seconds on the extension and 1 second on the contraction.
Form checklist
- Keep your core braced and avoid letting your lower back arch excessively during the extension.
- Ensure your feet do not touch the ground at any point during the set.
- Keep your shoulders down and away from your ears to avoid neck tension.
- Move your torso and legs simultaneously to maintain a fluid opening and closing motion.
Pro tips
- At the peak of the tuck, focus on pulling your belly button toward your spine for a deeper abdominal contraction.
- Squeeze your inner thighs and quadriceps together during the extension to increase stability and lower-ab engagement.
Make it harder
- Remove your hands from the stool and reach them forward or out to the sides to remove the balance assist.
- Slow down the extension phase to 4 seconds to significantly increase time under tension.
Frequently asked
- What muscles does the open and knee tuck on a padded stool work?
- The open and knee tuck on a padded stool primarily targets the abs and obliques, and also works the hip flexors as secondary muscles.
- What equipment do you need for the open and knee tuck on a padded stool?
- The open and knee tuck on a padded stool requires no equipment — just your body weight.
- Is the open and knee tuck on a padded stool good for beginners?
- Yes. The open and knee tuck on a padded stool is a beginner-friendly movement and a strong foundation to build on.