TETSU3/4 Sit-Up vs Weighted Front Plank
The 3/4 Sit-Up and the Weighted Front Plank both train the abs as their primary muscle. The 3/4 Sit-Up is bodyweight-only while the Weighted Front Plank adds external weight to a bodyweight pattern. Here is how they compare and when to pick each.
Side-by-side comparison
| 3/4 Sit-Up | Weighted Front Plank | |
|---|---|---|
| Primary muscle | abs | abs |
| Body part | waist | waist |
| Supporting muscles | hip flexors and lower back | shoulders and lower back |
| Equipment | bodyweight | added weight |
| Steps in our guide | 5 | 8 |
How each one starts
3/4 Sit-Up — first steps
- Lie flat on your back with your knees bent and feet flat on the ground.
- Place your hands behind your head with your elbows pointing outwards.
Weighted Front Plank — first steps
- Start by lying face down on the floor.
- Place your forearms on the ground, with your elbows directly under your shoulders.
Full step-by-step guides are linked below.
Which should you choose?
The 3/4 Sit-Up needs no equipment and scales through leverage, tempo and reps. The Weighted Front Plank adds external load to a bodyweight pattern for direct overload. 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 3/4 Sit-Up better than the Weighted Front Plank?
Neither is universally better — both train the abs as the primary mover. The 3/4 Sit-Up needs no equipment and scales through leverage, tempo and reps, while the Weighted Front Plank adds external load to a bodyweight pattern for direct overload. Choose based on your equipment and which movement you can progress consistently.
Can I do both the 3/4 Sit-Up and the Weighted Front Plank 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 3/4 Sit-Up and the Weighted Front Plank work the same muscles?
The primary muscle is the same: the abs. Supporting muscles differ slightly — hip flexors and lower back for the 3/4 Sit-Up versus shoulders and lower back for the Weighted Front Plank.
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.