MariposasHow to Do the High Knees
By Zachary, builder of Mariposas · Reviewed against published exercise-science sources (references)
· Last updated June 2026
High knees pack a surprising amount of training stimulus into a zero-equipment movement: they simultaneously drive hip flexor strength through a full pumping range, load the quads eccentrically on each landing, and spike heart rate fast enough to serve as genuine cardio conditioning. What separates them from a plain jog in place is the deliberate drive to waist height on every rep, which forces active hip flexion rather than passive shuffle mechanics and teaches the body to recruit the hip flexors explosively. That combination makes high knees a legitimate tool for athletes working on sprint mechanics, general fitness enthusiasts looking for a fast warm-up activator, and anyone who needs intensity without a treadmill. Track your high knees sessions, duration, and progress for free in the Mariposas app.
How to do it
- Stand tall with your feet hip-width apart, arms bent at roughly 90 degrees at your sides, and your core lightly braced before you take a single step.
- Fix your gaze on a point at eye level directly in front of you so your head stays neutral and your chest doesn't collapse forward as fatigue builds.
- Drive your right knee upward until your thigh is at least parallel to the floor, actively contracting the hip flexor rather than just swinging the leg with momentum.
- As the right knee rises, pump your left arm forward so the opposite arm and leg move together, mirroring the same arm-swing pattern used in sprinting.
- Lower the right foot back to the floor under your hip, not in front of it, making contact with the ball of the foot to keep your weight forward and your stride quick.
- Immediately drive the left knee up to the same parallel-or-above height while the right arm pumps forward, maintaining a continuous rhythm without pausing between reps.
- Keep your torso upright and your hips directly under your shoulders throughout; a forward lean is the most common form breakdown and it cuts the hip flexor range of motion significantly.
- Sustain the chosen duration or rep count at a pace that lets you hit full knee height on every single rep rather than sacrificing form for raw speed.
Form cues
- Knee to hip height, every rep.
- Ball of foot, not heel.
- Tall chest, hips under shoulders.
- Pump the arms, don't let them dangle.
- Land quiet, not heavy.
Common mistakes
- Shuffling instead of driving: When the knee never clears hip height the movement becomes a jog in place and the hip flexors barely work; slow the tempo down and focus on the lift rather than the speed until height becomes consistent.
- Heel striking on landing: Landing on the heel shifts impact forces up the shin, slows the transition between reps, and removes the elastic spring that makes the drill efficient; consciously aim for a ball-of-foot contact point on every touchdown.
- Leaning the torso forward: A pronounced forward lean shortens the available range for hip flexion and turns the drill into a lower-back dominant movement; think about pressing your hips forward under your ribcage rather than chasing speed with your chest.
- Letting the arms go limp: Dropping the arm drive removes the rhythmic counterbalance, makes it harder to generate knee height, and breaks the neuromuscular pattern that transfers to sprinting; keep elbows at 90 degrees and match the arm pump to every knee lift.
- Holding the breath: Because the tempo is fast, people often tense up and stop breathing, which accelerates fatigue and raises perceived exertion unnecessarily; exhale on every few reps or find a rhythmic breathing pattern in the first ten seconds of each set.
Why do the High Knees?
- High knees develop active hip flexor strength through a repeated full-range pumping motion, a quality that carries over directly to running speed and stride length since most people never train the hip flexors under load at all.
- The quick ground contact demands eccentric quad control on every landing, building the kind of reactive leg strength that matters in sports and helps protect the knee joint during deceleration.
- Because they require no equipment and can hit a moderate-to-high metabolic intensity fast, high knees function as a dense conditioning tool that elevates heart rate within the first 15 to 20 seconds, making them practical for time-limited sessions.
- The drill reinforces the contralateral limb pattern (opposite arm and leg moving together) that underlies every form of bipedal movement, so consistent practice genuinely improves running coordination over time.
- Used as a dynamic warm-up primer, high knees raise muscle temperature in the quads and hip flexors specifically, the two muscle groups that do the most work in lower-body strength sessions, making them a more targeted choice than a generic lower-body warm-up.
High Knees variations
- Slow Marching High Knees
- A beginner regression where each knee drive is held for a brief pause at the top, letting the lifter focus on hitting full height and maintaining posture before adding any tempo.
- High Knee Skip
- Adding a small hop on the standing leg turns the drill into a plyometric variant that increases ground reaction forces and is commonly used by athletes specifically targeting sprint power.
- Banded High Knees
- A resistance band looped around the thighs just above the knees adds external resistance to the hip flexor drive, intensifying the strength stimulus without changing the movement pattern.
- Weighted Vest High Knees
- Adding a light vest increases the total load on the quads and cardiovascular system simultaneously, a useful progression once bodyweight high knees no longer produce meaningful cardio challenge.
How to program it
High knees tend to appear in one of two contexts: as a 20-to-45-second dynamic warm-up drill before lower-body or sprint-focused sessions, or as a conditioning interval within circuit and HIIT formats where people commonly cycle through 20-to-60-second bouts with short rest periods. In strength programs they almost always sit at the start of a session rather than after heavy lower-body work, since fatigued quads and hip flexors make it hard to hit the knee height that makes the drill useful. For conditioning blocks, many coaches program them in a work-to-rest ratio of 1:1 or 2:1, running the interval hard enough that slowing down to maintain form marks the natural end of each bout.
High Knees alternatives
FAQ
- Do high knees actually build muscle or just cardio fitness?
- They develop both hip flexor and quad function, but in a repeated, lower-load way that builds muscular endurance and coordination rather than the kind of hypertrophy you'd chase with a leg press. The cardio benefit is real and fast-acting since heart rate climbs quickly, but the movement is genuinely strengthening the hip flexors in a way that isolated stretching or passive work simply doesn't.
- How high do the knees actually need to go?
- The standard target is thigh parallel to the floor, meaning the top of the knee reaches hip height. Going higher than that is fine but rarely necessary. The key is that you're actively driving the knee up rather than letting it drift there passively, because the muscle recruitment difference between a driven and a lazy knee lift is significant even if they look similar from the outside.
- Can high knees hurt your knees?
- For most people with healthy joints they're low risk because the impact forces on a proper ball-of-foot landing are moderate and the movement is short-contact. The higher-risk pattern is heel striking, which sends more force up the leg, or landing with the foot in front of the body, which creates a braking force on the knee. Keeping the landing directly under the hip and staying on the forefoot addresses most of the mechanical concern.
- Are high knees a good warm-up before squats or deadlifts?
- They work well before squats specifically because they warm up the quads and hip flexors in a dynamic way and get the heart rate up. Before deadlifts they're less targeted since that pattern relies more on hip hinging and posterior chain. A brief set of 20 to 30 seconds is enough to serve the warm-up purpose without accumulating fatigue.
- What's the difference between high knees and running in place?
- The distinction is intentional knee height and active hip flexor drive. Running in place is usually a shuffle where the knees barely clear the shins. High knees require the thigh to reach parallel or above on every rep, which changes the mechanical demand entirely and is why the hip flexors are listed as a primary muscle rather than a secondary one.