Barbell vs Dumbbell Curl
The barbell bicep curl is on this site already and is an excellent exercise. The dumbbell version offers two distinct advantages. First, each arm works independently — the same argument as the single-arm row versus the barbell row. If one bicep is stronger than the other, the dumbbell curl will expose it and correct it over time. Second, the dumbbell allows the wrist to rotate naturally through the movement — a process called supination — which produces a stronger contraction at the top. The barbell fixes the wrist position throughout, which some people find uncomfortable and which limits the natural arc of the curl.
How to Perform It
Stand or sit holding a dumbbell in each hand at the sides, palms facing inward (neutral grip) at the start. As the curl begins, rotate the wrist so the palm faces upward (supination). Continue curling until the dumbbells are at shoulder level and the biceps are fully contracted. Hold the peak contraction for one second — this is important and most people skip it. Lower slowly under control, rotating back to the neutral grip at the bottom. The upper arms stay fixed at the sides throughout. If the elbows are travelling forward or the torso is rocking back, the weight is too heavy.
The Biggest Mistake in the Gym
Walk into any gym and you will see people swinging dumbbells upward with their entire body, torso rocking backward, momentum doing the work that the bicep should be doing. This is one of the most common and most pointless things in any weights room. The bicep curl is a small, precise movement. The upper arm is fixed. The elbow is the only joint that moves. Everything else is still. A strict twelve-repetition curl with a lighter weight will produce far more bicep development than a swinging, heaving set of eight with a weight that required the whole body to lift.
Seated vs Standing
Both work well. Standing allows you to use very slightly more weight. Seated — particularly on an incline bench — places the upper arm behind the torso which creates a greater stretch on the bicep at the bottom of the movement. The incline dumbbell curl, performed seated on a bench set to sixty to seventy degrees with the arms hanging behind the body, is one of the most effective bicep exercises available and worth including if the equipment allows.
Programming
Three to four sets of ten to fifteen repetitions. The dumbbell curl belongs at the end of a training session, after all compound work is complete. Biceps receive substantial indirect work from rows, pulldowns and chin-ups — the curl finishes them off. Perform all reps on one arm before switching, or alternate arms with each repetition. Rest sixty seconds between sets.
