Trainers say circuit training is the most efficient type of workout you can do (plus: 3 example workouts)

It combines strength and cardio into one total body sweat session.
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How to plan the most time-efficient strength-training workout, according to science

Are you interested in strength training but have no time to waste? NNOXX examined academic research to identify an efficient workout. - Mladen Zivkovic // Shutterstock Are you interested in strength ...