TETSUBottoms-Up vs Weighted Decline Sit-Up
The Bottoms-Up and the Weighted Decline Sit-Up both train the abs as their primary muscle. The Bottoms-Up is bodyweight-only while the Weighted Decline Sit-Up adds external weight to a bodyweight pattern. Here is how they compare and when to pick each.
Side-by-side comparison
| Bottoms-Up | Weighted Decline Sit-Up | |
|---|---|---|
| Primary muscle | abs | abs |
| Body part | waist | waist |
| Supporting muscles | obliques and hip flexors | hip flexors and lower back |
| Equipment | bodyweight | added weight |
| Steps in our guide | 5 | 5 |
How each one starts
Bottoms-Up — first steps
- Lie flat on your back with your legs extended and your arms by your sides.
- Bend your knees and bring them towards your chest, keeping your feet off the ground.
Weighted Decline Sit-Up — first steps
- Lie flat on a decline bench with your feet secured under the foot pads.
- Place your hands behind your head or across your chest.
Full step-by-step guides are linked below.
Which should you choose?
The Bottoms-Up needs no equipment and scales through leverage, tempo and reps. The Weighted Decline Sit-Up 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 Bottoms-Up better than the Weighted Decline Sit-Up?
Neither is universally better — both train the abs as the primary mover. The Bottoms-Up needs no equipment and scales through leverage, tempo and reps, while the Weighted Decline Sit-Up 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 Bottoms-Up and the Weighted Decline Sit-Up 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 Bottoms-Up and the Weighted Decline Sit-Up work the same muscles?
The primary muscle is the same: the abs. Supporting muscles differ slightly — obliques and hip flexors for the Bottoms-Up versus hip flexors and lower back for the Weighted Decline Sit-Up.
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.