Step-by-Step Instructions

1
Sit on a bench with your feet flat and knees spread wide, holding a dumbbell in one hand.
2
Lean forward slightly and brace the back of your working arm's triceps firmly against your inner thigh, just above the knee.
3
Start with your arm fully extended, the dumbbell hanging just off the floor, palm facing away from your thigh.
4
Curl the dumbbell upward by flexing the elbow, supinating the wrist slightly as you approach the top to maximize biceps contraction.
5
Squeeze the biceps hard at the top for 1-2 seconds, then lower the dumbbell slowly over 3 seconds to full extension.
6
Complete all reps on one arm before switching sides, keeping the opposite hand on the opposite knee for stability.

Common Mistakes

Lifting the elbow off the inner thigh during the curl, which allows shoulder flexion and reduces biceps isolation.
Swinging the torso or using a rocking motion to generate momentum on the concentric phase.
Not extending the arm fully at the bottom, which limits the range of motion and reduces the stretch stimulus.
Curling the wrist excessively at the top instead of keeping it neutral to slightly supinated, which overloads the forearm flexors.

About This Exercise

The dumbbell concentration curl eliminates momentum by bracing the working arm's triceps against the inner thigh, isolating the biceps brachii — particularly the short head — through a strict, full-range curl. This exercise is renowned for producing the highest EMG activation of the biceps among common curl variations, largely because the seated, braced position prevents any body English or shoulder involvement. It is best used as a finishing exercise to drive peak contraction and mind-muscle connection.

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