Here's A 12-Minute HIIT Workout You Can Do In Your Apartment

Now that the days are getting shorter and the weather is getting chillier, you might be less excited about working out outdoors.

The good news is that you don't have to be stuck in a gym all winter long to stay fit and healthy. There's plenty you can do in your apartment—no matter how small! HIIT workouts are a perfect indoor workout option because they require very little equipment but allow you to get a lot done in a short amount of time.

Set an interval timer to 18 rounds of 10- and 30-second intervals. Rest on the 10-second ones, then work as hard as you can during the 30-second ones. The harder you work, the more you'll get out of this workout!

Stand in a side-lunge position with one leg bent parallel to the floor and the other leg straight to the side. Jump up explosively as you switch legs. Now the previously straight leg will be bent, and the previously bent leg will be straight to the other side. Try to keep your core tight and stay as low as possible as you switch sides as fast as you can.

Stand with your feet slightly wider than shoulder-width apart. Lower yourself into a wide squat position with your thighs about parallel to the floor. Jump up as explosively as you can, then land in a narrow squat with your feet close together. Jump back up, then land in a wide squat. That's one rep. Repeat.

Stand to the side of a chair, couch, or other elevated surface. Do a burpee, then step onto the box with one leg, then bring the other leg up so that you're standing on top of the box. Step down with one leg, then bring the other leg down to the ground and immediately do another burpee.