You don't need to exercise for hours to burn more calories: All it takes is a few smart tweaks to your regular routine.
1. Beat the clock
Slow and steady doesn't win the race when it comes to shedding maximum pounds. Rather than counting your squats, pushups, or lunges, time those exercises to get in as many reps in, say, 60 seconds, as you can, recommends John Hall, CPT, a personal trainer in Chicago. Also, try not to rest too much between reps. "This is a two-fold win," says Hall. "The time spent exercising decreases and the heart rate increases, which means you're burning more calories faster."
2. Work in bursts
Whether your usual cardio is an outdoor jog or you prefer to sweat on an indoor machine, use measured intervals to alternate bursts of speed with bouts of recovery. Set times to complete each speed, or, for outdoor sessions, use markers such as telephone poles to designate fast vs. slow phases, suggests