TETSUAssisted Sit-Up vs Reverse Crunch
The Assisted Sit-Up and the Reverse Crunch both train the abs as their primary muscle. The Assisted Sit-Up is an assisted movement while the Reverse Crunch is bodyweight-only. Here is how they compare and when to pick each.
Side-by-side comparison
| Assisted Sit-Up | Reverse Crunch | |
|---|---|---|
| Primary muscle | abs | abs |
| Body part | waist | waist |
| Supporting muscles | hip flexors | hip flexors |
| Equipment | assisted | bodyweight |
| Steps in our guide | 6 | 5 |
How each one starts
Assisted Sit-Up — first steps
- Sit on the edge of a bench or have someone hold your feet down.
- Lie flat on your back with your knees bent and feet flat on the ground.
Reverse Crunch — first steps
- Lie flat on your back with your arms extended along your sides.
- Bend your knees and lift your feet off the ground, bringing your thighs perpendicular to the floor.
Full step-by-step guides are linked below.
Which should you choose?
The Assisted Sit-Up reduces the load so you can own the movement before going unassisted. The Reverse Crunch needs no equipment and scales through leverage, tempo and reps. If your gym has both options, neither is a wrong choice: pick the one that feels strongest through a full range, and swap after 6 to 8 weeks to keep the abs adapting.
Full form guides
Common questions
Is the Assisted Sit-Up better than the Reverse Crunch?
Neither is universally better — both train the abs as the primary mover. The Assisted Sit-Up reduces the load so you can own the movement before going unassisted, while the Reverse Crunch needs no equipment and scales through leverage, tempo and reps. Choose based on your equipment and which movement you can progress consistently.
Can I do both the Assisted Sit-Up and the Reverse Crunch in the same program?
Yes, but usually not in the same session — they overlap heavily on the abs. A common setup is one as your main movement and the other on a second training day, or alternating them block by block.
Do the Assisted Sit-Up and the Reverse Crunch work the same muscles?
Yes — the primary muscle is the same (abs) and both rely on the same supporting muscles: hip flexors.
Track it in Tetsu
Tetsu tracks both movements separately, keeps your PRs per exercise, and tells you which one is actually progressing. Free to start.