TETSUBosu Ball Squat vs Weighted Sissy Squat
The Bosu Ball Squat and the Weighted Sissy Squat both train the quads as their primary muscle. The Bosu Ball Squat uses a bosu ball while the Weighted Sissy Squat adds external weight to a bodyweight pattern. Here is how they compare and when to pick each.
Side-by-side comparison
| Bosu Ball Squat | Weighted Sissy Squat | |
|---|---|---|
| Primary muscle | quads | quads |
| Body part | upper legs | upper legs |
| Supporting muscles | glutes, hamstrings and calves | glutes, hamstrings and calves |
| Equipment | bosu ball | added weight |
| Steps in our guide | 7 | 6 |
How each one starts
Bosu Ball Squat — first steps
- Place the bosu ball on the ground with the flat side up.
- Stand with your feet shoulder-width apart and position yourself on top of the bosu ball.
Weighted Sissy Squat — first steps
- Stand with your feet shoulder-width apart and your toes pointing slightly outward.
- Hold a weight in front of your chest with both hands, or place a barbell across your upper back.
Full step-by-step guides are linked below.
Which should you choose?
The Bosu Ball Squat adds an unstable surface that raises core demand. The Weighted Sissy Squat 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 quads adapting.
Full form guides
Common questions
Is the Bosu Ball Squat better than the Weighted Sissy Squat?
Neither is universally better — both train the quads as the primary mover. The Bosu Ball Squat adds an unstable surface that raises core demand, while the Weighted Sissy Squat 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 Bosu Ball Squat and the Weighted Sissy Squat in the same program?
Yes, but usually not in the same session — they overlap heavily on the quads. 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 Bosu Ball Squat and the Weighted Sissy Squat work the same muscles?
Yes — the primary muscle is the same (quads) and both rely on the same supporting muscles: glutes, hamstrings and calves.
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.