Do 10 to 15 repetitions. (Note that you may use substantially less weight for this than for curls or chest press.) Advanced: Eventually try building up to this 3-minute routine. Pull-ups.

A trainer shares the ultimate 15-minute workout that torches fat like a 5K—no running required, just high-intensity results.

Fitness trainer Jay T. Maryniak, known as JTM_FIT, has designed a 15-minute workout that promises to revolutionize your ...