How Many Calories Do You Burn Doing Leg Raises? | Core Burn Math

Calories Burned From Leg Raises: Real Numbers

Energy use during ab work depends on intensity. Gentle floor work sits around 3–3.8 METs, mid-effort core drills reach roughly 4–5 METs, and hanging variations can feel like full-body calisthenics near ~8 METs. A MET is a standard way to describe activity cost; moderate work lives between 3–5.9 METs while vigorous starts at 6.0. You can skim the CDC’s plain description of MET intensity categories for a quick benchmark in everyday terms (CDC intensity guide).

The practical math is straightforward: Calories ≈ MET × body mass (kg) × 0.0175 × minutes. That’s the formula used across exercise science and in widely cited compendiums. Plugging in a 70 kg person for 10 minutes gives a quick sense of spread: about 37 kcal at 3.0 METs, ~61 kcal at 5.0 METs, and ~98 kcal at 8.0 METs.

Early Estimates For Popular Variations

The table below shows typical MET ranges and 10-minute calorie estimates for a 70 kg person. Numbers are rounded to keep it scannable.

Variation	Approx. MET	10-Minute Calories (70 kg)
Supine Straight-Leg Raises	3.0–3.8	37–46
Reverse Crunch (Knees To Chest)	4–5	49–61
Hollow Hold Intervals	3.5–4.5	43–55
Hanging Knee Raises	6–7	74–86
Hanging Straight-Leg Raises	~8	~98
Captain’s Chair Raises	6–8	74–98

These ranges mirror the way research groups assign METs to bodyweight exercise, then convert that to energy cost. When your plan includes strength and movement for overall health, fat loss depends mostly on daily balance: food, steps, and structured training. Many readers find core sessions feel more purposeful once they’ve sketched their calorie deficit for weight loss and know where ab work fits.

What Moves The Number Up Or Down

Body Mass And Lever Length

Heavier bodies spend more energy per minute at the same MET, so the same 10-minute block costs extra calories for a larger lifter. Lever length matters too: straight legs increase the moment arm at the hip, raising effort compared with a bent-knee curl.

Tempo, Range, And Time Under Tension

Slow 2-1-2 tempo builds time under tension and taxes the trunk without spiking breathing rate. Speed work with crisp reps and short rest bumps the MET and the calorie line, yet it can trade away perfect form. Smooth reps with a firm posterior pelvic tilt keep stress on the target tissues.

Equipment And Stability Demand

Hanging options recruit lats, grip, and stabilizers. That full-body demand moves the intensity toward vigorous territory. A captain’s chair can be easier to control because the forearms rest on pads; a straight bar increases swing control and core bracing.

Set Design

Ten minutes could be steady repeats or intervals. An interval block like 30s work / 15s rest elevates breathing and METs. A skill block with long rests focuses on perfect reps and keeps the energy line flatter.

Use METs To Personalize Your Estimate

Here’s a simple way to tailor the numbers. Pick a style that matches your session, estimate the MET from the table, then run the quick calculation:

Step-By-Step

1. Convert weight to kilograms (lb ÷ 2.2046).
2. Choose a MET that fits effort (gentle 3–3.8; mid 4–5; hanging near 8).
3. Calories ≈ MET × kg × 0.0175 × minutes.

Cross-checking with widely used charts helps sanity-check your output. Harvard’s activity table lists 30-minute calorie costs for calisthenics across three body weights, which lines up with these MET-based ranges (Harvard calories chart).

Technique That Keeps The Work Honest

Brace And Tilt

Before every rep: exhale, brace, and lightly tuck the pelvis so your low back doesn’t arch. That keeps the hip flexors from stealing the show and channels effort to the lower abs.

Control The Bottom

The lower third of the arc is where form leaks. Stop just short of the point where the low back pops off the floor. As you get stronger, extend the arc gradually.

Use Regressions And Progressions

Start with bent-knee taps, then straighten one leg at a time, then both legs. Move to reverse crunches, then hanging knee raises, and finally strict hanging straight-leg raises.

Programming Ideas For Different Goals

Core Endurance Block (10 Minutes)

Alternate 30s of controlled supine raises with 15s rest for 10 rounds. Keep reps smooth and breathing steady. Expect something near the mid MET range.

Strength-Skill Block (12–15 Minutes)

Work sets of 6–8 strict hanging reps with long, 90-second rests. The effort per rep is high, yet the average energy line may sit lower than an interval block because rests are generous.

Mixed Circuit (15 Minutes)

Pair reverse crunches with plank and glute bridge in a circuit. Minimal equipment, plenty of trunk time, and manageable breathing.

Safety Notes And Common Pitfalls

Skip long, fast sets if your hip flexors or low back feel cranky the next day. Shorten the arc and bend the knees until the pelvis stays tucked. Save weighted variations until you can hit 12 smooth bodyweight reps without losing control.

Evidence Behind The Numbers

MET assignments for bodyweight training come from standardized lists used by researchers and clinicians. These resources label moderate work between 3–5.9 METs and vigorous work at 6.0 or higher, and list calisthenics across a spread that matches gentle floor work up to intense, whole-body efforts. The CDC explains how those intensity bands map to daily activity, while the Ainsworth team’s compendium remains the classic reference for MET values across hundreds of moves (CDC intensity guide).

Make It Personal With A Quick Table

Pick your weight and read across. Estimates assume 10 minutes of continuous work at the listed intensity.

Body Weight	Gentle Floor (3.0 MET)	Hanging Strict (8.0 MET)
50 kg (110 lb)	26 kcal	70 kcal
60 kg (132 lb)	32 kcal	84 kcal
70 kg (154 lb)	37 kcal	98 kcal
80 kg (176 lb)	42 kcal	112 kcal
90 kg (198 lb)	47 kcal	126 kcal
100 kg (220 lb)	53 kcal	140 kcal

How To Track Progress Without Guesswork

Pick one variation for four weeks, then increase total time or slow the tempo to add time under tension. Combine core work with steady walking, strength training for large muscle groups, and enough protein to support recovery. The daily energy picture matters more than the tiny differences between similar ab drills.

Frequently Missed Form Cues

Neck And Rib Position

Keep the ribs down and the chin gently tucked. If your neck lights up before your abs, reduce range and breathe out through the hard part of each rep.

Hip Flexor Dominance

If you feel front-of-hip more than trunk, shorten the lever. Try bent-knee raises with a pause at the top. The ab wall should feel like it’s doing the bracing, not the hip flexors doing all the lifting.

Putting It All Together

Core sessions don’t need to be long. Two or three 10-minute blocks per week add up, especially when paired with walking and a steady strength plan. If your goal is fat loss, total daily intake and movement carry most of the result; ab work is the finishing detail. When your day is balanced, the numbers in the tables above are enough to log sessions and keep expectations grounded.

Want a deeper primer on daily targets? Try our daily calorie intake guide for a full breakdown.