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A Trainer Explains When You Must Use Intervals Versus Reps To Turn On Your Training

9th March 2019
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In recent years, you’ve definitely seen that interval-based training has become increasingly popular. Think: the four-move, seven-minute circuits of Kayla Itsine’s Sweat app, or AMRAP (which, as I recently discovered, means “as many reps as possible”) that often serve as …