How Many Calories Are Burned In Les Mills GRIT Cardio? | Fast Facts Guide

Calories Burned In GRIT Cardio Classes: Real-World Ranges

Les Mills describes this format as a 30-minute high-intensity interval training class built on body-weight moves, sprints, and short recoveries. Those bursts push oxygen demand well above resting levels, so the energy cost rises quickly across the half hour. The range most people see lands between about 250 and 600 calories for a session of this type, with lighter athletes trending low and heavier athletes trending high.

The clean way to estimate your own number is to use MET values. MET stands for metabolic equivalent of task, a standard that expresses exercise intensity relative to rest. One MET equals the energy you use at rest. Aerobic formats that feel like “high impact” often sit near 8 METs, while step patterns with taller benches reach around 9 METs in the Compendium of Physical Activities. Intervals that approach all-out effort can spike higher for short bouts. You’ll plug a MET into a simple equation, then match it to body weight and time.

How To Estimate Your Personal Burn

The standard formula is: Calories = MET × body weight (kg) × time (hours). If you weigh 70 kg and work through a 30-minute class at an average of 10 METs, the math is: 10 × 70 × 0.5 = 350 calories. An athlete at 85 kg with the same intensity would land near 425 calories in the same session. Intervals fluctuate from minute to minute, so treat the chosen MET as an average across the workout.

Table 1 — Estimated Calories For A 30-Minute HIIT Class

This table shows sample outcomes using common averages seen in body-weight HIIT: 8, 10, and 12 METs. Pick the row that matches your weight and the MET that best reflects your pace on the day.

Body Weight (kg)	Average MET	Calories In 30 Min
50	8	200
50	10	250
50	12	300
60	8	240
60	10	300
60	12	360
70	8	280
70	10	350
70	12	420
80	8	320
80	10	400
80	12	480
90	8	360
90	10	450
90	12	540
100	8	400
100	10	500
100	12	600

Calories are only one piece of the picture; you’ll feel the difference in breathing rate and leg turnover once you set your daily calorie needs and keep sessions consistent across the week.

What Drives The Number Up Or Down

Body weight: The formula scales linearly with kilograms, so two people moving at the same pace land on different totals.

Intensity choices: Options matter. Swapping tuck jumps for power knee drives, or extending the work block, nudges the average MET upward. Les Mills coaches cue choices so newcomers can stay safe while seasoned athletes push.

Work-to-rest ratio: Longer bursts with short recoveries mean you spend more minutes near your max, which bumps the average. Equal work and rest keeps the average lower.

Floor space and travel: Sessions with lateral shuffles and repeated get-downs raise heart rate faster than a sequence with more marching or holds.

Heat and hydration: Warmer rooms and dehydration add strain, which can raise heart rate for the same mechanical output. Keep fluids handy and use the first track as a gauge.

Where GRIT Cardio Fits On The MET Scale

On the Compendium scale, “aerobic dance, high impact” sits at about 8 METs, and taller step heights reach around 9 METs. Short sprints and plyometric blocks in a modern HIIT class can pull the moment-to-moment intensity above those steady formats during the work phases. Across the full half hour, most people land near 8–12 METs on average, which matches the ranges used in the table above.

That scale helps you compare days. If you repeat the class with the same coach and playlist, but choose regressions during jumps, your average MET drops. If you keep the options but shorten recoveries, the average rises.

How To Pick A MET For Your Estimate

Step 1 — Start With 10 METs

For a standard push with full moves and near 1:1 work-to-rest, use 10 as your average. That aligns well with a session that leaves you winded but still moving well in the final track.

Step 2 — Nudge Down To 8 METs

Use 8 when you lean on options, extend breaks, or return after time off. You’ll still work, just with smaller spikes.

Step 3 — Nudge Up To 12 METs

Use 12 when the coach programs repeated explosive sets with shorter rests and you take the hardest options throughout. Expect a sweaty floor and a big cooldown.

Health Benchmarks And Class Frequency

A 30-minute HIIT class counts as vigorous aerobic time. Federal guidance sets the weekly target at 75–150 minutes of vigorous activity or 150–300 minutes of moderate activity, plus two days of muscle-strengthening. GRIT Cardio slots into the vigorous bucket. Two to three classes per week cover the aerobic piece for many adults when paired with strength work on separate days.
See the CDC overview of adult activity targets here.

Fuel, Recovery, And The “Afterburn”

Intervals can raise post-exercise oxygen use for a short window, often called afterburn. The size of that window varies with how hard you pushed and how short your rests were. It adds a modest bonus beyond the number you track from the class itself. Prioritize a balanced plate and sleep so you come back ready for the next session.

Technique Tweaks That Change Energy Cost

Range And Control

Full range squats, chest-up burpees, and true locks at the top of high knees bump the demand. Sloppy reps trim range and reduce the total. Move clean and strong.

Ground Contact

Softer landings take leg muscles through more work. Think “quiet feet” during jump tracks to spread force and keep joints happy.

Recovery Discipline

Walk tall during recoveries, breathe from the belly, and get back to set points before the next burst. Short, unfocused rests drag the average down later.

Table 2 — Quick Totals By Duration (10 MET Average)

Use this shortcut when your workout felt like a balanced push with options kept to a minimum.

Body Weight (kg)	20 Min (kcal)	30 Min (kcal)
55	183	275
65	217	325
75	250	375
85	283	425
95	317	475
105	350	525

Sample Class Flow And What It Means For Calories

Warm-Up (2–3 Min)

Rehearsal moves and light travel lift heart rate without rushing. Energy cost rises slowly here.

Main Blocks (20–24 Min)

Short sprints, plyometric tracks, and body-weight strength combos dominate the middle. This is where most of the calorie spend happens. The more explosive the set and the shorter the rest, the higher the average MET.

Finisher (2–4 Min)

A final burst often stacks fast feet with a jump pattern. The spike here can push the average up by a surprising amount, especially when recoveries have been brief.

Cooldown (2–3 Min)

Breathing settles and muscles relax. The body still uses extra oxygen for a short period, which adds a small bonus beyond the tabled numbers.

Safety And Smart Progression

New to this style? Pick options during jumps and reduce depth during the first weeks. Build contact quality before adding height. If you track heart rate, aim for a few peaks in the red, then drop back to yellow or green during recoveries so you can finish strong.

Putting It All Together

Use the formula and tables to set expectations, then let your coach and your body set the day’s pace. Keep water nearby, keep reps crisp, and treat the cooldown as part of the work. Consistency beats hero days.

Want a step-by-step refresher on energy balance? Try our calorie deficit guide next.