Warm up for five to 10 minutes by doing dynamic stretches – lunges with rotation, plus arm and leg swings – to loosen and activate muscles. Then start a one-minute timer and do as many reps of the first move as you can in that time. Record your score when done (on paper or into your phone) and start the timer again for one minute of active recovery: Jog in place, jump rope, or ride a stationary bike. Repeat this process until you have completed all 10 moves. Finish with a five- to 10-minute cool-down of static stretching. Save your score and retest yourself with this same process one week later to see how much you’ve improved ...

Fitness guru Jillian Michaels’ creative take on dumbbells will transform your body, giving you the strong, streamlined muscles you’ve been repping for. Guaranteed ...

Strap in for a suspension-training workout that will carve your core and slash fat fast ...

Warm up for five to 10 minutes by doing dynamic stretches – lunges with rotation, plus arm and leg swings – to loosen and activate muscles. Then start a one-minute timer and do as many reps of the first move as you can in that time. Record your score when done (on paper or into your phone) and start the timer again for one minute of active recovery: Jog in place, jump rope, or ride a stationary bike. Repeat this process until you have completed all 10 moves. Finish with a five- to 10-minute cool-down of static stretching. Save your score and retest yourself with this same process one week later to see how much you’ve improved ...