TETSUBiceps Leg Concentration Curl vs Machine Bicep Curl
The Biceps Leg Concentration Curl and the Machine Bicep Curl both train the biceps as their primary muscle. The Biceps Leg Concentration Curl is bodyweight-only while the Machine Bicep Curl uses a machine. Here is how they compare and when to pick each.
Side-by-side comparison
| Biceps Leg Concentration Curl | Machine Bicep Curl | |
|---|---|---|
| Primary muscle | biceps | biceps |
| Body part | upper arms | upper arms |
| Supporting muscles | forearms | forearms |
| Equipment | bodyweight | machine |
| Steps in our guide | 5 | 6 |
How each one starts
Biceps Leg Concentration Curl — first steps
- Sit on a bench with your legs spread apart and your feet flat on the ground.
- Hold a dumbbell in one hand and place your elbow on the inside of your thigh, just above the knee.
Machine Bicep Curl — first steps
- Adjust the seat height and position yourself on the machine with your back against the pad.
- Grasp the handles with an underhand grip, palms facing up, and keep your elbows close to your sides.
Full step-by-step guides are linked below.
Which should you choose?
The Biceps Leg Concentration Curl needs no equipment and scales through leverage, tempo and reps. The Machine Bicep Curl fixes the movement path so you can push close to failure with less skill 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 biceps adapting.
Full form guides
Common questions
Is the Biceps Leg Concentration Curl better than the Machine Bicep Curl?
Neither is universally better — both train the biceps as the primary mover. The Biceps Leg Concentration Curl needs no equipment and scales through leverage, tempo and reps, while the Machine Bicep Curl fixes the movement path so you can push close to failure with less skill demand. Choose based on your equipment and which movement you can progress consistently.
Can I do both the Biceps Leg Concentration Curl and the Machine Bicep Curl in the same program?
Yes, but usually not in the same session — they overlap heavily on the biceps. 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 Biceps Leg Concentration Curl and the Machine Bicep Curl work the same muscles?
Yes — the primary muscle is the same (biceps) and both rely on the same supporting muscles: forearms.
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.