Split Squat: Form, Stance Length and a Bodyweight Progression

A split squat is a squat in a staggered stance: one foot forward, one foot back on the ball of the foot, and you lower straight down until the back knee almost touches the floor, then stand up without moving your feet. Most of the work falls on the front leg. It is the third rung of the squat ladder, after the box squat and the air squat, and the first one that puts most of your weight on one leg.

When you are ready for split squats

The squat ladder runs box squat, air squat, split squat, Bulgarian split squat. Move to split squats when you can do 3 sets of 15 air squats with heels flat and the same depth on every rep. The ladder’s move-up rule reads “3 sets of 15, or 8 per leg”: 3 × 15 for the two-leg rungs, and 3 sets of 8 per leg for one-leg rungs like this one. Below, that target comes with one condition: a 3-second pause at the bottom.

How to do a split squat

You need a folded towel or a cushion for the back knee, and a wall or door frame nearby for the first sessions.

Kneel to set the stance. Kneel on the towel on your back knee, front foot flat, front shin roughly vertical. Feet about hip-width apart side to side, like standing on two train tracks rather than one tightrope.
Tuck the back toes. The back heel stays up for the whole set.
Stand up. Drive through the front heel, with the whole foot flat, until both knees are nearly straight. Your feet don’t move; this is now your stance.
Lower straight down. Hips go down, not forward. Take about two seconds.
Touch and go. The back knee lightly touches the towel. Don’t rest on it or bounce off it.
Stand back up through the front heel. Finish all reps on one leg, then switch.

A rep counts when the back knee touches the towel, the front heel stays down, and your hips stay level. A rep that stops short of the towel is a miss; end the set there and log the honest count.

Stance length: what the research shows

Kneeling gives you a sensible starting stance. Two small lab studies of loaded split squats show what changes if you move the front foot from there.

A longer step shifts work to the hip. Song and colleagues (2023) had 20 male PE students do barbell split squats at four step lengths, set as 50%, 70%, 100% and 120% of each person’s leg length (measured from the bony point at the side of the hip to the outer ankle bone). From the shortest to the longest step, the peak hip extension moment rose by about 15% and glute activity rose. The knee moment peaked at 70% and was lowest at 120%. Glute activity stopped rising past 100%, and at 120% people tended to slip forward, so the authors recommended a step about one leg length long.

Forward knee travel shifts work to the knee. Chang and colleagues (2016) had 12 men do split squats with a barbell of 25% of bodyweight, keeping the step at 85% of leg length and changing only the front shin angle. With the shin tilted well forward (60°, against 90° for a vertical shin), the peak knee moment was about 50% higher and the knee force about twice as high. The authors noted the loads were still lower than in running or jumping and judged them safe for healthy adults, though they named knee ligament load as a question for future studies. An earlier study by Schütz and colleagues (2014) found a related trade: a more forward shin gives the front knee more range of motion, a more upright shin gives the back knee and hip more.

What this means for you:

Your knee may pass your toes. It is a dial, not a fault. More knee travel means more quad work.
If the front knee hurts, take a longer step and keep the front shin closer to vertical. That moves load from the knee to the hip.
Don’t chase a very long step. Past about one leg length, glute activity stopped rising and people slipped more.

Treat the numbers as direction, not precision. Both studies used young men with barbells, one is a conference paper, and neither tested bodyweight sets.

Muscles worked

Muscle	Role
Quads (front leg)	Straighten the knee; a main mover at every step length
Glutes (front leg)	Straighten the hip; work harder with a longer step
Hamstrings, adductors and calves	Help extend the hip and steady the knee and ankle
Back leg	Takes part of the weight and keeps you balanced
Trunk and hip stabilizers	Keep the pelvis level and the torso upright

One leg vs two: what the research says

One-leg work is not better for muscle growth, as far as the research goes. A 2025 meta-analysis of 9 training studies (Kassiano and colleagues) found no difference in muscle growth between one-leg and two-leg training. Strength was specific: one-leg training built more one-leg strength, two-leg training more two-leg strength. An earlier meta-analysis of 14 studies (Liao and colleagues, 2022) also found two-leg training better for two-leg strength, and no clear difference for one-leg strength.

The reason split squats matter here is practical, not magic. Without a barbell, putting your bodyweight on mostly one leg is the cheapest way to make leg work heavy enough to keep progressing. That is why the squat ladder turns single-leg after the air squat.

What goes wrong, and the fix

These are coaching rules of thumb, not tested in studies.

What you see	Likely cause	Fix
You wobble or tip sideways	Feet in one line	Widen the feet side to side to hip-width; hold a wall with one hand for now
The front heel lifts	Step too short	Kneel and reset the stance; move the front foot a few inches forward
You drift forward as you lower	Thinking “lunge,” not “squat”	Aim the back knee straight down at the towel
The front knee caves inward	Fatigue or a narrow stance	Keep the knee over the middle toes; end the set when it caves
Front knee pain	Lots of forward knee travel	Longer step, more vertical shin, as above
Lower back arches at the top	Hips pushed forward	Squeeze the back leg’s glute and keep the ribs down
Reps get shallow late in the set	The set is too long	Stop at the first rep that misses the towel

If pain stays the same or gets worse over a couple of sessions despite these changes, stop doing the exercise and get it checked.

The split squat progression

The 30-minute session gives the squat block a rule: add a three-second pause at the bottom before you add reps. On this rung that means you alternate two kinds of week:

Normal week: 3 sets per leg at your current reps, normal tempo.
Pause week: the same reps, with a 3-second pause at the bottom. Pause with the back knee about an inch above the towel, then touch it lightly and stand. The rep standard is the same: touch, heel down, hips level.

The rule for moving on: when every rep in all of the week’s sessions met the rep standard, take the next step on the path. If any rep missed, repeat the week.

Step	Sets × reps per leg	Tempo
1	3 × 6	Normal
2	3 × 6	3-second pause
3	3 × 7	Normal
4	3 × 7	3-second pause
5	3 × 8	Normal
6	3 × 8	3-second pause: rung cleared

If every week goes to plan, that is six weeks. Most people repeat a few.

Your first session: try step 1. If you can’t finish 3 × 6 per leg to the towel, do the supported split squat: one hand on a wall or door frame, used for balance only, at 3 × 6 per leg. Each session, try the first set without the hand. A full week of clean 3 × 6 per leg without support clears step 1. If 3 × 8 per leg is clean in the first session, go straight to step 6.

Keep the 10 walking lunges per leg that the squat block alternates with your sets. Six one-leg sets plus the lunges can run past the block’s 5 minutes, especially in pause weeks; let it run over rather than cutting sets.

After step 6, the next rung is the Bulgarian split squat, with the back foot raised on a bench or step. Expect your reps to drop when you move up.

Where this fits in the plans

Foundation plan: three full-body sessions a week. Use split squats in the squat block of all three, and apply the moving-on rule to all three sessions.

Build plan: leg days are Wednesday and Saturday, and the second session of each pair normally runs a rung harder. While you are still on the path above, both leg days are split squats at the same step. Once you clear step 6, Saturday moves up to the Bulgarian split squat and Wednesday stays on split squats at 3 × 8 per leg with the pause.

If you are not sure which plan is yours, take the four-rep test first. The squat checkpoints in the standards table run from 25 air squats to 10 Bulgarians per leg; this rung is the bridge between them.

Frequently asked questions

What muscles do split squats work?

Mainly the quads and glutes of the front leg, which straighten the knee and hip as you stand up. The hamstrings, adductors and calves help, the back leg takes some of the weight and steadies you, and the trunk and hip muscles keep you balanced. A longer stance shifts more of the work to the glutes.

Is a split squat the same as a lunge?

No. In a split squat both feet stay planted and you only move up and down. In a lunge you step into or out of the stance on every rep, which adds balance and deceleration work. The split squat is the easier version: the same bottom position without the step.

How do I do a split squat as a beginner?

Start half-kneeling on a folded towel, front shin roughly vertical, then tuck the back toes and stand up without moving your feet. Lower until the back knee lightly touches the towel and stand again. If you wobble, hold a wall or door frame with one hand until you can do 3 sets of 6 per leg without it.

Should my knee go past my toes in a split squat?

It can. Letting the front knee travel forward puts more load on the knee and less on the hip; it is not a mistake in itself. In a small study, a shin tilted well forward raised the knee moment by about half compared with a vertical shin, and the authors still judged it safe for healthy adults. If your knee hurts, take a longer step and keep the shin more upright.

How many split squats should I do?

On this site’s squat ladder, 3 sets per leg, two or three times a week, starting at 6 reps per leg. Add a 3-second pause at the bottom before you add a rep. Once you can do 3 × 8 per leg with the pause, move up to the Bulgarian split squat.