The concentration curl is a classic biceps-building exercise, but the form is more difficult than you might think. Use these tips to do the move the right way.

If you want to take on The Rock's bent-over concentration curl, drop down a few pounds from your standard biceps curl weight (notice how the man himself is only using 40 pounds) and make sure that ...

The data showed that the concentration curl significantly outperformed the rest, triggering the most muscle activation. The cable curl came in second, and chin-ups took third place.

The concentration curl can be an essential addition to your training routine to help build big arms and make your biceps pop, but are you sure you're even doing the exercise correctly?

Concentration curls: This variation is performed seated, holding a dumbbell in one hand. The upper body leans forward slightly, with the elbow placed on the inside of the same side knee, arm straight.

If you want to take on The Rock's bent-over concentration curl, drop down a few pounds from your standard biceps curl weight (notice how the man himself is only using 40 pounds) and make sure that ...