Sometimes it seems like there just aren’t enough hours in the day to accomplish everything. But even if you’re short on time, you can still go for your Challenge goals. Cut your workout short without shortchanging your results. Here’s how:

15-Minute HIT Workout

Fifteen little minutes can make a big difference. Get the most impact and maximize every minute with high-intensity interval training. For each exercise below, go as hard as you can for 50 seconds and rest for 10 seconds.

Set 1

Jump rope

High knees

Burpees

Mountain climbers

Lunge jumps

Set 2

Squats

Fast feet

Speed skaters

Jumping jacks

Sprints

Set 3

Pushups

Bicep curls

Tricep dips

Shoulder presses

Ab crunches