High Knees
hip flexors
What moves the load, and what it costs
4.3MET
Hip flexors is the prime mover, with the calves, quadriceps, abs assisting. Conditioning and hip-flexor endurance in one. Stay tall — the moment the torso leans back, it becomes a shuffle.
Cue: Drive the knees to hip height with a tall torso and quick ground contacts.
SOURCE·2024 Adult Compendium of Physical Activities·FILED UNDER CIRCUIT TRAINING·REVIEWED JUL 2026
SHARED AXIS · SEVEN VALUES FROM ONE TABLE · HIGHLIGHTED ROW IS THIS MOVEMENT
The compendium files high knees under a category, not a lift. Read the ladder as position, not precision: this is heavier work than sitting quietly by a factor of 4.3, and middling for conditioning work.
Turning that MET value into a real energy cost
- Map the movement to a published category. The compendium measures categories of conditioning work, never individual lifts, so high knees is filed under Circuit training, moderate effort.
- Take the category's MET value — 4.3. One MET is the cost of sitting quietly, so this is 4.3 times resting metabolism.
- Multiply by 3.5 to get millilitres of oxygen per kilogram per minute, the unit the MET is actually defined in.
- Multiply by your bodyweight in kilograms and divide by 200. The result is kilocalories per minute of work.
- Count working minutes only. Under load, not under the roof — a set of eight is about 25 seconds of the hour you were there.
kcal/min = MET × 3.5 × body mass (kg) ÷ 200 High Knees: 4.3 × 3.5 × 70 ÷ 200 = 5.27 kcal/min
SOURCE·ACSM metabolic equation + 2024 Adult Compendium of Physical Activities·REFERENCE BODY MASS 70 KG·REVIEWED JUL 2026
What is actually doing the work
| Muscle | Role | What it does here |
|---|---|---|
| Hip flexorsIliopsoas and rectus femoris | Prime mover | Lift the thigh towards the chest. They drive every leg raise and knee raise, which is why 'ab' exercises often feel like hip work. |
| CalvesGastrocnemius and soleus | Synergist / stabiliser | Point the foot down (plantarflexion). Gastrocnemius also crosses the knee, so it works hardest with the leg straight; soleus takes over when the knee is bent. |
| QuadricepsRectus femoris and the three vasti | Synergist / stabiliser | Straightens the knee. Rectus femoris also crosses the hip and flexes it, so it is loaded differently in a squat than in a leg extension. |
| AbsRectus abdominis | Synergist / stabiliser | Bends the trunk forward and, more usefully, resists it being extended backwards. Both a crunch and a plank load it — differently. |
The prime mover produces the movement against the resistance; synergists assist and stabilisers hold a joint still without moving it. An exercise trains the whole muscle it loads — there is no way to work only part of a muscle, and no exercise removes fat from the area around it.
Set up, then earn the rep
Bodyweight. Every rep should look like the first one. The moment it stops looking like the first one, the set is finished.
PATTERN · SQUAT
- Start standing tall with the trunk braced and the feet hip width.
- Move at a pace you can hold for the full working interval, not a pace you can hold for ten seconds.
- Drive the knees to hip height with a tall torso and quick ground contacts.
- Keep the whole foot loaded on landing and the knees soft.
- Breathe rhythmically rather than holding your breath.
- Work in timed intervals with defined rest, so the effort is measurable from week to week.
Where this one breaks down
Not theory. These are the faults you correct on a gym floor, and the correction that actually works.
Starting at a sprint.
Pace the first interval so the last one looks the same.
Landing on stiff legs.
Absorb through the ankles, knees and hips on every contact.
Treating conditioning as fat loss on its own.
It builds work capacity and burns some calories. The deficit that changes body composition is decided in the kitchen.
Regress it, or progress it
Regress — earn it first
Nothing on this site regresses it further: this is already near the entry point of its pattern. Take load off, shorten the range, or slow the tempo — in that order.
Progress — the next demand
This sits at the top of its progression here. Add load, add range, slow the tempo or go single-limb before you go looking for a new exercise.
Prescription: load, reps, rest
Read off the goal, then hold the technique constant as the load climbs. Derived from the movement's mechanics, not invented for this page: a explosive movement is destroyed by fatigue, so reps stay low and rest stays long.
| Goal | Sets | Reps | Rest | Notes |
|---|---|---|---|---|
| Power | 4–6 | 2–5 | 2–3 min | Every rep is fast or the set is over. Fatigue kills the quality this trains. |
| Athleticism | 3–5 | 3–6 | 90–120 sec | Quality of landing matters as much as height or distance. |
| Conditioning | 4–8 | 8–12 | 45–60 sec | Used this way it is cardio, not power work — pick one intent per session. |
| Beginner | 2–3 | 3–5 | 2 min | Learn to land softly before you try to go higher or heavier. |
Time under load, in kilocalories
Read these as minutes of work, not minutes in the building. A set of eight takes about twenty-five seconds; the rest of the hour is rest, chalk and queueing.
Mapped category: Circuit training, moderate effort — 4.3 MET. That is the published category this movement is filed under, not a measurement of this specific lift.
Worked at 4.3 MET × 3.5 × 70 kg ÷ 200 = 5.27 kcal per working minute for a 70 kg adult. Scale it by your own bodyweight; the equation is linear. The full activity dataset lives at BurnLab.
SOURCE·2024 Adult Compendium of Physical Activities·CATEGORY VALUE, NOT A PER-EXERCISE MEASUREMENT·REVIEWED JUL 2026
If the rack is taken
Substitutes train the same prime mover through the same pattern with different kit. Computed from the muscle and pattern data on this card, not hand-picked to fill a grid.
Nothing here trains the same prime mover through the same pattern. Swap the pattern rather than the muscle, and accept the session will look different.
This one needs no equipment at all, which is why it belongs in every travel and home programme. Every no-equipment movement is listed together.
Where it sits in a week
One movement is not a programme. The twelve templates put these in order, including 6 that need no gym at all.
The questions that come up on the floor
What muscles does the high knees work?
High Knees is an explosive movement in which the hip flexors is the prime mover, assisted by the calves, quadriceps, abs. Lift the thigh towards the chest. They drive every leg raise and knee raise, which is why 'ab' exercises often feel like hip work.
Is the high knees good for beginners?
Yes. It rates 2 out of 5 for technical difficulty on this site — learnable in a session or two; low injury cost if it goes wrong. Start with the lightest sensible load and two or three sets of 3–5.
What can I do instead of the high knees at home?
Nothing is needed — the high knees already requires no equipment at all, which is why it belongs in any home programme.
How many sets and reps of the high knees should I do?
For muscle size, 3–5 sets of 3–6 with 90–120 sec rest. For strength, 4–6 sets of 2–5 with 2–3 min rest. In your first month, 2–3 sets of 3–5, stopping well short of failure. Total weekly hard sets per muscle group matters more than the exact rep number in any of these ranges.
Does the high knees burn fat from the hip flexors?
No. No exercise removes fat from the area it trains — spot reduction has been tested repeatedly and does not happen. Training the hip flexors builds the muscle underneath; where body fat is lost from is decided by an overall calorie deficit and by your genetics, not by which exercise you chose.
Muscle roles follow standard kinesiology references and are described by joint action rather than by gym convention — see how this site is built. Energy figures are derived from the 2024 Adult Compendium of Physical Activities. Every reference is named and dated on the sources page. General information only — not medical or coaching advice. Load, form and progression should be adjusted to your own experience and any injury history. When in doubt, get coached in person.
SOURCE·Published exercise references·MUSCLE ROLES ASSIGNED BY JOINT ACTION·REVIEWED JUL 2026
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