Dumbbell-bench-press

2. Splice heavy and light

That’s not to say you should ditch the light weights altogether. While low and heavy hoists your afterburn, less pounds equals more calories burned during your actual workout, say researchers from the College of New Jersey. To get the best of both worlds, splice heavy and light routines – think heavy and three to seven reps one day, light and 10 to 20 the next. To make your workout multitask, cram both credos into one four-set session, allocating light and heavy to two consecutive sets each.