Updated October 2026
HIIT stands for high-intensity interval training. It is a way of working out where you go hard for a short stretch, rest or move easy for a shorter one, then repeat. You will also see it written "H.I.I.T." or shortened to "HIT". Same thing.
That's the whole definition. The rest of this page covers what a HIIT session looks like, a few workouts you can try, and the questions people ask most.
The two halves of the name tell you how it works:
A common pattern is 40 seconds of work and 20 seconds of rest. Another is 20 seconds on and 10 off, repeated eight times (often called Tabata). Some sessions are all one movement, like sprints on a bike. Others rotate through squats, push-ups, rows and jumps.
Because the effort is high, the session can be short. Many HIIT workouts run somewhere between 10 and 30 minutes including the warm-up. For someone fitting training around work and kids, that is the appeal: a hard workout that doesn't need a free afternoon.
People search for a "HIIT class description" because they want to know what they're walking into. A typical one runs in three parts:
Equipment is usually simple: a kettlebell, a pair of dumbbells, a jump rope, a box, or just your body weight. You work at your own level. If the workout says 12 reps and you can do 8 with good form, do 8.
Warm up first. Pick the one that matches your day, and scale it down if it's too much. Two terms to know: AMRAP means "as many rounds (or reps) as possible" in the time given, and EMOM means "every minute on the minute": you start a new round at the top of each minute and rest for whatever time is left.
Do each move for 40 seconds, rest 20 seconds, then go to the next. Complete the list three times, resting 1 to 2 minutes between rounds.
At the start of every minute, do this, then rest until the next minute begins:
If you can't finish in under a minute, lower the reps or swap the wall walks for a plank walk-out. If it feels easy, move faster so you get more rest.
As many rounds as possible in 10 minutes:
Count your rounds. Next time, try to beat the number, not the person next to you.
Is HIIT the same as cardio? It works your heart and lungs, so it counts as cardio, but it is built differently. Steady cardio, like a long walk or an easy bike ride, keeps one moderate effort going. HIIT swings between hard and easy.
How often should you do HIIT? Because it's hard on the body, most people do it one to three times a week, with easier days or rest days between. Many newer exercisers start with once or twice a week and add more as recovery allows. Our post on rest days and recovery explains why those days matter.
How many calories does HIIT burn? There isn't one number. It depends on your body size, how hard you actually work and how long the session runs, so be wary of any article that promises a specific figure.
How long until you see results? It varies from person to person and depends on what else you do: sleep, food, how regularly you show up. A few steady weeks of training is a more realistic way to think about it than a promise on a calendar.
Is HIIT safe for beginners? It can be, if you scale it. Start with lower-impact versions (step instead of jump, knees instead of toes), keep the rest periods honest, and stop if something hurts in a way that feels wrong. If you have a heart condition, are pregnant, or have an injury, check with your doctor before starting.
Do I need a gym for it? No. Workout 1 above needs nothing but floor space. If your time is tight, our 30-minute full-body workout for busy people is another one to do at home.
If you'd rather not plan the rounds yourself, KSAC's SWEAT Bootcamp is the class to look at. It's functional fitness for all levels: we squat, lift heavy and move well, and we just don't use barbells during the conditioning part of the day. A coach leads the class and scales the workout to you.
We're in South Overland Park, and your first 2 classes are free. No pressure, no contract. You can see how to get started here.
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