TETSUBent Knee Lying Twist vs Smith Squat
The Bent Knee Lying Twist and the Smith Squat both train the glutes as their primary muscle. The Bent Knee Lying Twist is bodyweight-only while the Smith Squat uses a smith machine. Here is how they compare and when to pick each.
Side-by-side comparison
| Bent Knee Lying Twist | Smith Squat | |
|---|---|---|
| Primary muscle | glutes | glutes |
| Body part | upper legs | upper legs |
| Supporting muscles | obliques and hip flexors | quadriceps, hamstrings and calves |
| Equipment | bodyweight | smith machine |
| Steps in our guide | 6 | 9 |
How each one starts
Bent Knee Lying Twist — first steps
- Lie flat on your back with your knees bent and feet flat on the ground.
- Extend your arms out to the sides, perpendicular to your body.
Smith Squat — first steps
- Set up the smith machine with the barbell at an appropriate height for your squat.
- Stand with your feet shoulder-width apart, toes slightly turned out.
Full step-by-step guides are linked below.
Which should you choose?
The Bent Knee Lying Twist needs no equipment and scales through leverage, tempo and reps. The Smith Squat fixes the bar path so you can push close to failure with less balance demand. 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 glutes adapting.
Full form guides
Common questions
Is the Bent Knee Lying Twist better than the Smith Squat?
Neither is universally better — both train the glutes as the primary mover. The Bent Knee Lying Twist needs no equipment and scales through leverage, tempo and reps, while the Smith Squat fixes the bar path so you can push close to failure with less balance demand. Choose based on your equipment and which movement you can progress consistently.
Can I do both the Bent Knee Lying Twist and the Smith Squat in the same program?
Yes, but usually not in the same session — they overlap heavily on the glutes. 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 Bent Knee Lying Twist and the Smith Squat work the same muscles?
The primary muscle is the same: the glutes. Supporting muscles differ slightly — obliques and hip flexors for the Bent Knee Lying Twist versus quadriceps, hamstrings and calves for the Smith Squat.
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.