15 HIIT Exercises You Can Do at Home

Here's the secret fitness pros don't always shout about: you don't need a fancy membership or a garage full of weights to get fitter, faster. You need a timer, a little space, and the willingness to work hard for short bursts.

That's the magic of HIIT. Below are 15 moves you can do in pajamas, plus a ready-made workout at the end. Fair warning: exercise #12 is the one everyone loves to hate.

Wait, what exactly is HIIT?

HIIT stands for High-Intensity Interval Training. You go all-out for a short burst, rest briefly, then repeat. A classic format is 40 seconds of work followed by 20 seconds of rest.

Why people are obsessed with it:

• It's fast. A solid session fits into 15 to 25 minutes.
• It builds your engine. Short, hard efforts challenge your heart and lungs in a way a slow stroll can't.
• The "afterburn" is real. Your body keeps using a bit of extra energy after a hard session while it recovers. It's not magic, but it's a nice bonus.
• Zero equipment. Your body weight is the whole gym.

The rule that makes it work: during work intervals, push hard enough that talking feels tough. During rest, actually rest.

Lower-body burners (1-5)

These fire up the biggest muscles in your body, which means your heart rate climbs fast.

1. Jump Squats

Squat down like you're sitting into a chair, then explode straight up. Land softly and sink right into the next squat.

• Why it's worth it: legs, glutes and a quick cardio spike in one move.
• Make it easier: skip the jump and rise onto your toes instead.

2. Jumping Lunges

Start in a lunge, jump up, and switch legs in the air. Land in a lunge on the other side.

• Why it's worth it: it trains each leg on its own and tests your balance.
• Make it easier: step back into alternating reverse lunges.

3. Skater Jumps

Leap sideways from one foot to the other, like a speed skater. Swing your arms for momentum.

• Why it's worth it: it works the sides of your hips and your coordination.
• Make it easier: step side to side instead of jumping.

4. Speed Squats

Bodyweight squats, as many as you can with good form. Chest up, knees tracking over your toes.

• Why it's worth it: the burn shows up around second 25, and that's the point.
• Make it easier: slow down and go only as deep as feels comfortable.

5. Lateral Shuffles

Stay low in an athletic stance and shuffle quickly three steps right, then three steps left. Touch the floor at each end if you want extra spice.

• Why it's worth it: it gets you moving in a direction most workouts ignore.
• Make it easier: stand a bit taller and shuffle at a steady pace.

Upper body and core (6-10)

Flat-belly promises are everywhere. The truth: a strong core comes from moves like these, done consistently.

1. Push-Ups

Hands under shoulders, body in a straight line from head to heels. Lower your chest toward the floor, then press back up.

• Why it's worth it: chest, shoulders, arms and core, all at once.
• Make it easier: drop to your knees or push against a wall or countertop.

2. Plank Jacks

Hold a high plank and jump your feet wide, then back together, like a jumping jack on the floor.

• Why it's worth it: your core has to fight to keep your hips still.
• Make it easier: step one foot out at a time.

3. Mountain Climbers

From a high plank, drive your knees toward your chest one at a time, as fast as you can.

• Why it's worth it: it's cardio and core work disguised as one move.
• Make it easier: slow the pace or put your hands on a sturdy couch or step.

4. Plank Shoulder Taps

In a high plank, tap your left shoulder with your right hand, then switch. Keep your hips as still as possible.

• Why it's worth it: it trains your core to resist twisting, which protects your back.
• Make it easier: widen your feet or do it from your knees.

5. Bicycle Crunches

Lie on your back, hands behind your head. Bring your right elbow toward your left knee while the other leg extends, then switch.

• Why it's worth it: it hits the sides of your waist, not just the front.
• Make it easier: keep your feet closer to the floor and move slowly.

Full-body cardio finishers (11-15)

Save these for the end. They're short, brutal, and oddly satisfying once you're done.

1. High Knees

Run in place, driving your knees up to hip height and pumping your arms.

• Why it's worth it: it's the fastest way to get your heart pounding.
• Make it easier: march in place with big, quick knee lifts.

2. Burpees (yes, the one everyone hates)

Squat, place your hands down, jump your feet back to a plank, jump them back in, and leap up with your arms overhead. That's one.

• Why it's worth it: it works nearly every muscle you have in about three seconds.
• Make it easier: step your feet back and forward, and skip the jump at the top.

3. Star Jumps

Crouch low, then jump up and spread your arms and legs wide into a star. Land softly and repeat.

• Why it's worth it: it's a jumping jack with a power upgrade.
• Make it easier: do regular jumping jacks, or step-out jacks.

4. Tuck Jumps

Jump straight up and pull your knees toward your chest. Land softly on the balls of your feet.

• Why it's worth it: it builds explosive power in seconds.
• Make it easier: do small hops on the spot instead.

5. Bear Crawl

On hands and toes with knees hovering just off the floor, crawl forward four steps, then back four steps.

• Why it's worth it: shoulders, core and legs all work together, and it's harder than it looks.
• Make it easier: take smaller steps or just hold the hover position.

Your done-for-you 20-minute HIIT workout

Warm up for 3 minutes with marching, arm circles and slow squats. Then do each move for 40 seconds, rest 20 seconds, and move straight through all three rounds.

Finish with 2 minutes of easy walking and stretching. Total: about 20 minutes.

Brand new to this? Start with 20 seconds on and 40 seconds off, and do just one or two rounds.

5 rules to get results (and avoid injury)

1. Form beats speed. Ten clean reps beat twenty sloppy ones.
2. Land softly. Quiet feet protect your knees, and your downstairs neighbors.
3. Two or three sessions a week is plenty. HIIT is intense, so your body needs recovery days.
4. Fuel and hydrate. Drink water and eat enough protein to help your muscles recover.
5. Listen to your body. Sharp pain means stop. If you have a health condition or injury, check with a doctor first.

The bottom line

You don't need more time. You need 20 focused minutes and these 15 moves. Save this article, pick your favorites, and hit start on your timer today.

Your future self is already thanking you.