How Many Calories Do 10 Leg Raises Burn? | Ab Math

Calories Burned By 10 Leg Raises: Real-World Math

Short sets don’t torch much energy. Ten reps usually take 20–30 seconds. The burn comes from your weight, your tempo, and how hard the set feels. We use MET values and a simple equation to size the number.

Here’s the quick math many coaches use: kcal per minute = MET × 3.5 × body weight (kg) ÷ 200. The Compendium of Physical Activities lists METs for common moves, including calisthenics at 2.8–8.0 depending on effort. A faster set or a tougher variant bumps the MET.

Estimated Calories For 10 Leg Raises (20 s per set)

Body Weight	Gentle (≈2.8 MET)	Vigorous (≈8.0 MET)
50 kg	≈0.8 kcal	≈2.3 kcal
60 kg	≈1.0 kcal	≈2.7 kcal
70 kg	≈1.1 kcal	≈3.3 kcal
80 kg	≈1.3 kcal	≈3.8 kcal
90 kg	≈1.5 kcal	≈4.2 kcal

Those figures assume a smooth 2-second cadence per rep. If your set lasts closer to 30 seconds, slide the numbers up by roughly half. A 70 kg lifter might move from ~1.1 to ~1.7 kcal at a light pace and from ~3.3 to ~4.9 kcal at a hard pace.

How We Turn Reps Into Calories

The Equation

Start with METs. One MET reflects resting oxygen use. Multiply the MET by 3.5, multiply by your body weight in kilograms, and divide by 200 to get kcal per minute. Multiply by your set length in minutes.

The MET Choice

Leg raises are a form of calisthenics. The Compendium lists calisthenics at 2.8 MET for light abdominal work, about 3.8–4.5 for moderate effort, and 8.0 for vigorous sets that feel truly tough. A strict hanging raise with no swing sits near the high end. A slow, controlled floor set usually sits in the middle.

Time On Tension

Ten quick reps can be over in 15 seconds. Slow reps can take 30 seconds or more. Since the formula uses minutes, doubling the time roughly doubles the burn. Eccentric control matters here.

Body Weight

Heavier bodies spend more energy at the same MET and time. That’s why the table rises by weight even when the pace stays constant.

Variant Differences

Lying bent-knee raises are easier on the spine and usually lighter on energy. Straight-leg raises load the lever arm and raise the cost. Hanging work adds grip and hip flexor effort, so the number climbs again.

Worked Examples You Can Copy

Example: 60 Kg, Moderate Floor Set

Pick 3.8 MET, 60 kg, and 20 seconds. Plug in: 3.8 × 3.5 × 60 ÷ 200 × 0.333 = ~1.3 kcal. Stretch the set to 30 seconds and you’re near ~2.0 kcal.

Example: 85 Kg, Strict Hanging Set

Pick 8.0 MET, 85 kg, and 25 seconds. Plug in: 8.0 × 3.5 × 85 ÷ 200 × 0.417 = ~5.0 kcal. A slower 30-second set reaches ~6.0 kcal.

For wider context, check the Harvard activity table. It lists 30-minute burns for calisthenics across body sizes, which lines up with the ranges above when you scale down to seconds.

What Changes The Number Most?

Tempo Tricks

Use a 2-0-2 tempo. Lift for two counts, pause briefly, then take two counts to lower. No swing. That longer eccentric boosts both control and energy cost.

Form And Range

Posterior tilt the pelvis and press your lower back into the floor on lying versions. Raise to a height you can control, then lower without arching. Quality beats speed.

Set Density

Stack sets with short rest if you want more total burn. Three to five sets of 10 reps, spaced by 30–45 seconds, will raise the session total while keeping form tidy.

Progressions

Move from bent-knee to straight-leg. Add a brief isometric hold at the top. Switch to a captain’s chair, then to hanging. Each step nudges the MET higher.

How Many Calories Does A Whole Ab Block Burn?

Most ab work costs less than folks think. The benefit comes from strength and control. Still, you can nudge totals by stacking crisp sets without sloppy reps.

Build-A-Set Planner (70 kg, moderate pace)

Sets × Reps	Active Time	Estimated Burn
3 × 10	~1 min	≈ 3–4 kcal
4 × 10	~1.3 min	≈ 4–6 kcal
5 × 10	~1.7 min	≈ 6–8 kcal

Those totals use 3.8–4.5 MET and a 20-second set. Longer sets with slow lowers will push the range up. Hard hanging work pushes much higher.

Quick Calculator: Your 10-Rep Estimate

Step 1 — Pick Your MET

Light floor work: 2.8–3.5. Smooth straight-leg: 3.8–4.5. Strict hanging: ~8.0.

Step 2 — Time Your Set

Count it once. Ten smooth reps often land between 18 and 28 seconds.

Step 3 — Do The Math

kcal = MET × 3.5 × body weight (kg) ÷ 200 × minutes. Keep a note on your phone and reuse it.

Step 4 — Reality Check

Compare your number with the early table. If you’re far off, your MET pick or set time likely needs a tweak.

Technique Tips That Spare Your Back

Brace First

Exhale, draw ribs down, and lock your pelvis before the first rep. That helps you keep a neutral spine.

Move Slow Where It Counts

Lower under control. The eccentric is where many lose tension. A steady two-count pays off.

Stop One Rep Shy Of Sloppy

Once your back arches or your hips tilt, that’s the last rep. Save the win for the next set.

Where 10 Leg Raises Fit In

Use them after your main lift as a core finisher. Pair them with a plank or a dead bug for balance. Two or three short clusters per week build skill and strength without wrecking recovery.

Sample Ab Blocks With Estimated Burn

Beginner — Six Minutes

Do 3 × 10 bent-knee floor raises at a 2-0-2 tempo with 45 seconds rest. Add a 30-second plank between sets. A 70 kg mover lands near 6–9 kcal of active work across the raises and 6–8 kcal from the planks.

Intermediate — Eight Minutes

Do 4 × 10 straight-leg floor raises at a 2-0-2 tempo with 40 seconds rest. Add a 20-second hollow hold after each set. That same 70 kg mover will sit near 10–14 kcal on the raises and 8–10 kcal on the holds.

Advanced — Ten Minutes

Do 5 × 10 hanging knee raises with a dead hang and no swing. Rest 45 seconds. Slip in a 15-second slow negative on the final rep each set. Expect roughly 18–25 kcal across the raises at 70 kg, more if you’re heavier or your sets run long.

Tracking Tips Without A Calculator

Use quick rules when you’re away from a spreadsheet. On a 70 kg frame, a light 10-rep set sits near 1–2 kcal, a moderate set near 2 kcal, and a hard hanging set near 3–5 kcal. Double it for 20 reps if the pace stays the same.

Keep context in view. Always. If your training block also includes squats, rows, or carries, those bigger moves will do most of the energy work. Leg raises bring spine-friendly core strength and control. That’s the real prize.

Want precision later? Drop your sets and times into a note with a link to the Compendium and the MET equation. You’ll have a repeatable method that scales to any ab move.