The exercise ball preacher curl is a great way to isolate the bicep muscles. Grab a barbell and place it in front of a exercise ball.

Kneel in front of the exercise ball and reach over it to grasp the barbell.

Your chest should be on one side of the ball and upper arms on the other.

Starting with your arms outstretched, slowly curl the barbell up as far as possible.

Pause, and then slowly lower the bar back to the starting position.

Repeat for desired reps.

Exercise Tips:

Keep the rep timing slow and control the weight.

Really squeeze the biceps hard at the top of the movement to get the most out of the exercise.

Focus on only allowing your forearms to move.