High Knees — Maximum Speed: A Complete Guide
Quick Intro
High Knees — Maximum Speed is a sprint technique drill performed by running in place or forward while driving the knees up to hip height as fast as possible with quick ground contacts. It’s the standard fast high knees drill, with one easier variation and two harder ones, and it’s dosed in short timed sets.
Equipment Needed
High Knees — Maximum Speed needs no equipment, just enough open ground to run in place or cover a short distance.
Why High Knees — Maximum Speed Matters
Driving the knees to hip height as fast as possible asks the hip flexor (iliopsoas) and front of the thigh (quadriceps, rectus femoris) to lift each leg rapidly, while the calf (gastrocnemius) and deeper calf muscle beneath it (soleus) fire quickly on every ground contact to keep the tempo high. The glutes (gluteus maximus) and back of the thigh (hamstrings, biceps femoris) drive the leg back down and into the next lift. The shin (tibialis anterior) keeps the foot ready for a quick strike, and the front of the shoulder (deltoid, anterior) pumps the arms in sync with the legs to sustain maximum turnover. The abs (rectus abdominis) brace the trunk through the rapid, repeated knee drive. Speed is the main demand, with agility right behind it.
When to Do It
This exercise fits well as a warm-up primer before sprint or agility work, since driving the knees at speed activates the same hip flexor and calf firing rate a fast sprint depends on. It also works as a short, standalone conditioning burst on its own.
There’s little meaningful restriction on who can attempt this exercise given its bodyweight nature, though anyone with a current hip flexor or shin issue should approach it cautiously, since the rapid, repeated knee drive places a high demand on both.
Getting Ready
A general warm-up followed by a few submaximal knee lifts confirms the hip flexors and calves are ready before pushing for speed. A couple of reps at a moderate tempo ease into the pattern before committing to maximum turnover.
Step-by-Step Instructions
1. The setup. Stand tall with the arms bent at the elbows, ready to pump in sync with the legs.
2. The drive. Drive one knee up to hip height as fast as possible while the opposite arm pumps forward.
3. The switch. Plant that foot quickly and immediately drive the opposite knee up, keeping ground contact as brief as possible.
4. The repeat. Continue alternating at maximum tempo, staying tall through the torso rather than hunching forward.
How Many, How Often
High Knees — Maximum Speed is dosed in short, high-quality sets, since maximum tempo degrades quickly once fatigue sets in.
| Level | Where you’re at | What to do |
|---|---|---|
| Beginner | New to maximum-tempo knee drives | 3 sets of 10 to 15 seconds, resting fully between sets and focused on quick ground contacts over raw speed. |
| Intermediate | Ground contacts feel quick and consistent throughout | 3 to 4 sets of 15 to 20 seconds. |
| Advanced | Comfortable sustaining maximum tempo without slowing | 4 sets of 20 to 25 seconds, or move to High Knees — Moving Sprint once staying in place stops feeling like enough of a challenge. |
Quick ground contacts matter more here than how high each knee rises, since a fast, light foot strike is what separates maximum speed from a slower, exaggerated knee lift.
Modifications and Variations
High Knees — Maximum Speed has one easier step and two harder steps.
For an easier entry point, High Knees — Stationary removes the demand for maximum tempo, letting a beginner focus purely on knee height and ground contact quality. For more difficulty, High Knees — Moving Sprint adds forward travel to the same knee drive, and High Knees — Resisted Band adds band resistance that overloads the hip flexors directly.
Progression path: High Knees — Stationary builds the pattern first, this standard version adds tempo, with High Knees — Moving Sprint or High Knees — Resisted Band available afterward depending on whether the goal is forward travel or added resistance.
Common Mistakes to Avoid
Driving the knees out to the sides. Letting the knees swing outward wastes effort that should be going straight into hip height and turnover speed. Driving each knee straight up toward the chest keeps the movement efficient and fast.
Letting the arms hang passive during the drive. A weak or missing arm drive removes a contributor to overall turnover speed. Pumping the arms actively in sync with the opposite knee adds tempo to the whole movement.
Pushing on well past the point where tempo starts slowing. Continuing once ground contacts start dragging trains a compromised, lower-quality version of the drill. Ending the set once true maximum tempo can’t be sustained keeps every rep at full quality.
After Your Set
This exercise fires the hip flexors and calves hard through rapid, repeated ground contacts, so a couple of minutes of easy walking is worth taking before stretching. A low lunge with the back knee on the floor and the chest lifted releases the hip flexor after the intense, repeated knee drive. A standing calf stretch, leaning into a wall with the back heel pressed down, eases the calf after the rapid ground contacts.
Going Deeper
This exercise works well as a warm-up primer before sprint work, and it pairs naturally with acceleration drills done later in the same session, since the rapid hip flexor firing trained here carries directly into a faster first step. It also serves as a standalone conditioning tool, since short, maximal bursts like this build anaerobic capacity on their own.
Progress here tends to stall on ground contact time specifically: many people drive the knees high but let each foot linger on the ground a beat too long. Deliberately focusing on quick, light contacts on a few submaximal reps tends to fix this faster than simply trying to move the legs faster overall.
Someone new to this exercise generally needs a few sessions to build the hip flexor endurance maximum tempo demands, and sustains longer bursts of true top speed over the following few weeks as that endurance develops.
How to Know You’re Improving
- Ground contacts stay quick and light throughout the entire set
- Knee height reaches hip level consistently, not just on the first few reps
- The arm drive stays active and synced with the legs the whole time
- Maximum tempo holds up for longer before any noticeable slowdown
Quick, light ground contacts sustained for the whole set, not just how high the knees reach early on, is what marks progress here.
Muscles Worked
- Iliopsoas (the deep hip flexor, firing the knee up at the highest rate the hip can manage)
- Rectus Femoris (a front thigh muscle that crosses both the hip and knee, helping lift the thigh at full tempo)
- Gastrocnemius (a calf muscle, flicking the foot off the floor before it can settle)
- Gluteus Maximus (the largest glute muscle, driving the support hip down as fast as the other knee rises)
- Biceps Femoris (a muscle at the back of the thigh, snapping the raised foot back toward the ground)
- Tibialis Anterior (a muscle along the front of the shin, keeping the lifted foot cocked at speed)
- Soleus (a deeper calf muscle beneath the gastrocnemius, taking a very high number of contacts in a short time)
- Rectus Abdominis (the abdominal muscles running down the front of the stomach, holding the pelvis steady as the rate climbs)
- Anterior Deltoid (the front of the shoulder cap, swinging the arms fast enough to match the legs)
FAQ
Should I stay in place or move forward during this exercise? Either works, since this version can be performed running in place or covering ground, though High Knees — Moving Sprint is the dedicated version for anyone specifically wanting to add forward travel (see Modifications and Variations above).
Does this drill build strength? Very little. It trains rapid tempo and hip flexor endurance rather than raw force production (see Why It Matters above).
What’s a common technical mistake with this drill? Letting ground contacts linger a beat too long quietly slows the whole tempo down, even when the knees are still reaching a good height (see Common Mistakes above).
Is this a good warm-up before sprinting? Yes, driving the knees at speed activates the same hip flexor and calf firing rate a fast sprint depends on, making it a useful primer before sprint or agility work (see When to Do It above).