One arm preacher curls is great to target the brachialis, which is the lower part of your bicep. However, adding a Swiss ball will make the exercise more difficult and add some core stabilization which will burn more calories. Make sure when executing this exercise you keep your core tight at all times so that you don't lose control of the ball. Place one of your arms on the ball with the back of the arm against the Swiss ball with dumbbell. Use the other arm as support or place around the front of the Swiss ball. Slowly, lower your arm with the dumbbell to about 90 degrees and curl it back to starting position. You don't want to go beyond this because you can hyper extend your shoulder which can lead to future injury. Repeat on the other arm.

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