Health & Fitness

Hurry up and get strong, burn fat, and boost your endurance with workouts you can do in just 25, 15, or even five minutes. by Anthony J. Yeung What’s better than packing on lean muscle, melting stubborn fat, and building the endurance of a boxer? How about doing it in less than the time it takes to watch an episode of South Park? Sometimes, like during the holidays, it can be hard to schedule a typical 60-minute gym routine. Fortunately, you don’t have to—not if you’re willing to go all-out. Put these three workouts on your to-do list this month and prove to yourself just how little time you actually need to look like an athlete and perform at your very best.   Endurance Kicker TIME: 5 MINUTES Norwegian researchers found that high-intensity interval training boosted VO2 max (the amount of oxygen the bloodstream can carry to the muscles) more than traditional steady-state cardio—even if the steady-state work was done at a whopping 85% of maximum heart rate. “If you can maintain high for