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.

This apartment-friendly HIIT workout will take you only 12 minutes to complete and doesn't require any equipment except for a chair or couch. So you have no excuse not to do it! All you need is your body and an interval timer.

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!

Go through the following exercises three times until the final timer beeps.

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.

If speed skater lunges make too much noise for your fussy neighbors, substitute them with side lunges instead.

Start in a push-up position, with your shoulders directly over your hands. Tighten your abs, glutes, and thighs. While lowering your chest to the floor, bring one knee toward your elbow on the same side of the body. Push yourself back up and repeat on the opposite side.

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.

If jumping is just too loud, just take it out altogether by doing one wide squat then following with a narrow squat.

Start in a downward-dog position and walk your feet toward your hands so that your shoulders are above your hands. Lower your forehead down toward the floor so that you touch the floor or as far as possible. Raise back up to the starting position and 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.

Continue going in the other direction, speeding up so you go as fast as you can.

Lie on your back with your hands by your side. Pulling your belly button toward the ground, tuck your knees toward your chest, and raise your head and hands off the floor. Extend your legs until they're straight in front of you, continuing to press your back into the ground. Return your legs to the tuck position. That's one rep.