The wide-grip barbell curl is a good exercise for training the inner part of the biceps.
- Grasp a barbell with your hands at a wider than shoulder width, using an underhand grip (palms facing up).
- Your feet should be firmly on the floor, about should width apart. If you prefer, you can place one foot back. This is the starting position.
- Keeping your body fixed (do not swing!), slowly curl the weight up as far as possible.
- Squeeze the biceps, and then slowly lower the weight back to the starting position.
- Repeat for desired reps.