Dumbbell Concentration Curl

Starting position

1. Sit on the end of a bench with your feet wider than your shoulders and planted on the floor.
2. Hold a dumbbell in one hand with an underhand grip and lean forward slightly.
3. Brace the back of your upper arm, just above the elbow, against the inside of the same-side thigh. The working arm hangs almost straight.
4. Rest your free hand on the other thigh for support.

Execution

1. Exhale and curl the dumbbell toward your shoulder. The elbow stays pressed into your thigh.
2. Hold the top for 1–2 seconds and squeeze the biceps hard.
3. Inhale and lower slowly until your arm is almost straight.
4. Finish all reps on one arm, then switch.

Common mistakes

• Lifting with the torso — the back straightens to help and the isolation is lost.
• Elbow sliding off the thigh — the upper arm starts moving and the biceps lose tension.
• Dumbbell too heavy — you can't lower slowly or hold the top.
• Not lowering all the way — the muscle works in a shortened range.

Beginner tips

• This is a control exercise, not a heavy one: start with 4–5 kg.
• Start with your weaker arm and match the reps on the other side.
• Watch the working muscle — it helps you feel the contraction.

Alternatives

• Isolated Barbell Curl — similar upper-arm fixation, both arms work
• Seated Dumbbell Curl — easier to learn
• Standing Cable Biceps Curl — constant tension