ASK PRETTY MUCH any trainer what he or she recommends to clients who want to burn fat the fastest, and the answer will likely be HIIT. High-intensity interval training is so effective for two reasons: First, by including big multi-joint exercises (i.e., ones that utilize multiple muscle groups), HIIT requires the body to burn a lot during the workout itself. Second, and more important, the body continues to burn calories for hours afterward as it seeks to re-establish equilibrium. What’s even cooler is that you don’t need hours to dedicate to your workout—even 10 minutes can yield results.
This short workout, designed by Mark Beier, co-director of training at Shred415 in Chicago, maximizes every second with fast-paced strength moves interspersed with bouts of cardio.