Core · Bodyweight
Lying Knee Tuck
How to do the lying knee tuck, the muscles it works, and the mistakes to avoid. Pulled straight from the Kovo app's exercise library.
- Equipment
- Bodyweight
- Difficulty
- Beginner
- Logged as
- Reps
- Movement
- Flexion
- Mechanic
- Isolation
How to do it
Lie on your back with your legs extended and hands at your sides or under your hips for support. Draw both knees in toward your chest by curling your pelvis, then extend your legs back out without letting your heels touch the floor. Keep your lower back pressed down throughout.
- 1Lower abs working to pull your knees toward your chest
- 2Lower back staying flat against the floor
- 3Constant tension as the legs extend back out
Common mistakes
- Don't let your lower back arch off the floor
- Avoid swinging the legs with momentum
- Don't rest your heels down between reps
Muscles worked
The lying knee tuck mainly works the lower abs, with the hip flexors, upper abs, and obliques assisting.
- Lower AbsPrimary
- Hip FlexorsSupport
- Upper AbsSupport
- ObliquesSupport
- QuadsMinor
Kovo programs the lying knee tuck for you and tracks it every session.
We build your whole program, drop the right lifts into each workout, and adjust your weights as you get stronger. Free on iOS and Android.
More abs & core exercises
- How to do the ab wheel rollout
- How to do the ankle tap plank
- How to do the ankle taps
- How to do the resistance band dead bugs
- How to do the resistance band pallof press
- How to do the rollout
Last reviewed June 2026.