Core · Bodyweight
Seated Frog Half to Full Sit-up
How to do the seated frog half to full sit-up, 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
Sit on the floor and bring the soles of your feet together with your knees dropped out wide in a frog position. Lower your torso back toward the floor, then crunch up partway for a half sit-up, lower again, and crunch all the way up to a full sit-up. Alternate the half and full range, keeping the movement driven by your abs.
- 1The abs contracting hard to curl you up off the floor
- 2Your spine rounding segment by segment as you rise
- 3Even control on the way down, resisting gravity
Common mistakes
- Yanking on your neck to pull yourself up
- Using momentum or bouncing off the floor
- Letting your knees come up instead of staying wide
Muscles worked
The seated frog half to full sit-up mainly works the upper abs, with the lower abs, obliques, and hip flexors assisting.
- Upper AbsPrimary
- Lower AbsSupport
- ObliquesSupport
- Hip FlexorsSupport
- QuadsMinor
Kovo programs the seated frog half to full sit-up 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.