It's that time of year for barbecues, beach days and bikinis! With the holiday weekend just around the corner, we look for last-minute ways to shape up. This full-proof plan will whittle the waist, strengthen the muscles and boost your metabolism.
After an ample warm-up, think high-intensity sprints followed by recoveries that are determined based on your fitness level. The more fit you are, the longer the sprints, and sometimes the shorter the recoveries.