Core · Bodyweight
Lying Tuck-up Knee Tap
How to do the lying tuck-up knee tap, the muscles it works, and the mistakes to avoid. Pulled straight from the Kovo app's exercise library.
- Equipment
- Bodyweight
- Difficulty
- Intermediate
- Logged as
- Reps
- Movement
- Flexion
- Mechanic
- Isolation
How to do it
Lie on your back with your legs extended and arms reaching overhead. Crunch up by curling your torso while drawing both knees toward your chest, tap your knees with your hands at the top, then extend back out long without letting your feet touch down.
- 1Your abs crunching hard as your knees and chest meet
- 2Your lower abs pulling your knees in
- 3Constant tension as you extend long without resting on the floor
Common mistakes
- Yanking your head or neck forward to fold up
- Letting your feet drop to the floor between reps
- Using momentum instead of controlling both ends of the motion
Muscles worked
The lying tuck-up knee tap mainly works the upper abs and lower abs, with the hip flexors and obliques assisting.
- Upper AbsPrimary
- Lower AbsPrimary
- Hip FlexorsSupport
- ObliquesSupport
- QuadsMinor
Kovo programs the lying tuck-up knee tap 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.