The Concentration Curl is an isolation exercise for the biceps. Bracing your arm against your leg increased tension on the biceps muscles.
Concentration Curls Work:
Category: Bicep Workouts
How to do Concentration Curls:
Sit with your arms resting against your leg.
Keep your back straigh.
Extend your arm towards the ground.
Briefly pause at the bottom, then curl your arm back up.
Not getting a full extension of the arm.