Doing a step-up while holding a weight in the opposite hand of the leg you are stepping up with will help with balance and strengthen the muscles around the ankle, says Mr. Ordas.
Tony Ordas, a San Diego personal trainer and exercise specialist for the American College of Sports Medicine, says many surfers make the mistake of only working what Mr. Ordas calls their "mirror muscles, " those that get shown off when wearing a swimsuit, such as the abs and biceps.