High intensity interval training (HIIT) has the fitness industry buzzing because of its potential to torch maximum calories in a minimum amount of time. The idea is that you do short periods of all-out work followed by short periods of active rest to make the body work harder than it does during steady-state cardio. Now that summer is here, there are absolutely no excuses for not whipping yourself back into beach-body shape.

To capitalize on the benefits of HIIT, we reached out to George “Hit” Richards, celebrity fitness trainer and calisthenics expert, and Pete Bommarito, C.S.C.S., U.S.A.W., a certified MAT Jumpstart Specialist and owner of Bommarito Performance Systems, for a variety of interval workouts designed to burn fat, build muscle, and enhance sports performance. Get in the best shape of your life (and look like it, too) with these 10 fat-blasting interval workouts.

The first five interval workouts are courtesy of Richards. The last five interval workouts are courtesy of Bommarito.