Concentration Curl
10 reps
Brace your elbow on your thigh and curl the dumbbell up to your shoulder.
Tap to try it
What happens when you tap record
It all runs on your device
The camera and the rep-counting AI work right here in your browser. Nothing is streamed or uploaded while you train.
Every rep earns +1 XP
Watch your XP climb in the top bar as you go — no account needed to start earning.
Your clip stays on this device
The recording is kept locally in your browser. It only moves to the cloud once you create an account.
It carries over when you sign up
Make a free account and your reps and clips come with you — nothing you did here is lost.
BICEPS
Concentration Curl
The concentration curl is a highly focused biceps isolation move done seated with your working elbow braced against your thigh. Fixing the elbow like this cuts out momentum and other muscles, so the biceps do all the work. It's excellent for building peak contraction, refining form, and evening out differences between arms.
How to do it
- 1
Sit on the edge of a bench with your knees bent and feet flat, set wider than your shoulders.
- 2
Hold a dumbbell in your right hand and brace the back of your upper arm against the inside of your right thigh.
- 3
Keeping your elbow pressed to your thigh, curl the dumbbell up to shoulder height.
- 4
Squeeze your biceps at the top with your palm facing your shoulder.
- 5
Lower the dumbbell back down slowly to full extension, then finish your reps and switch arms.