When trying to get lean this summer, you’ll need to be consistent with your cardio. Many bodybuilders wonder just how much cardio they need to do to see decent changes in bodyfat. To answer that question, Texas researchers tested 90 male and female subjects over an eight-week program, dividing them into groups based on how often they exercised each week: a control group (no exercise), 30-minute cardio workouts less than twice a week, two or three times per week, and four or more times per week. Only the last group lost a decent amount of bodyfat — almost 15 pounds. So to maximize bodyfat loss via cardio, include a minimum of four days per week, for a minimum of 30 minutes each session.