The side split is the hard one, and it is the one Taekwondo actually needs most. Side kick, high roundhouse, and a head-height spinning hook kick all draw on it. It is also the split where people stall for months, get frustrated, and quit, almost always because they are stretching a muscle when the real limiter is bone and rotation. Warm up with (y-) the RAMP protocol before any of this.
(y-) Why It Is So Much Harder Than the Front Split
In a front split, the femur swings in the direction the hip socket is built to swing. In a side split, the leg abducts to 90 degrees, and at some point the neck of the femur runs into the rim of the hip socket. That is a bone-on-bone stop, and no stretching in the world moves it.
The way around it is rotation, not force. Externally rotating the femur, which means turning the knees and toes toward the ceiling, moves the femoral neck clear of the rim and buys you real degrees. This is why a side split with toes forward and knees up goes far lower than one with toes pointing down.
The two versions:
| Version | Setup | Use |
|---|---|---|
| Middle split (rotated) | Knees and toes up, hips tucked | The trainable one. Start here. |
| True straddle (neutral) | Knees and toes forward, flat back | Harder, more transferable to a straight side kick |
Train the rotated version to build range, then gradually rotate toward neutral. Trying to start neutral is how people spend a year going nowhere.
Also worth accepting early: hip anatomy varies a lot between people. Some hip sockets are angled in a way that makes a flat side split simply unavailable. That is not a training failure. A 160 degree straddle with strength and control kicks far higher than a forced 180 with none.
(y-) What Is Limiting You
Four separate things, roughly in order of how often they are the real culprit:
- Adductor length. The obvious one. Adductor magnus, longus, brevis, gracilis, pectineus.
- Hip internal and external rotation. Usually the actual blocker. Fix this and range appears without the adductors changing at all.
- Anterior pelvic tilt. If your lower back is arched, your femurs are already jammed forward into the socket rim. Tucking the pelvis under is often worth several inches instantly.
- Bone geometry. The hard ceiling. Only relevant once the first three are handled.
(y-) 1. Hip Rotation Work (do this first)
- 90/90 hip switches. Sit with both knees at 90 degrees, one leg in front and one to the side. Rotate to the other side without hands. 10 total, slow. This is the single highest-value drill on this page.
- 90/90 lift-offs. In the 90/90 position, lift the front shin off the floor and hold 3 seconds. Trains active rotation, which is what actually holds a side kick up.
- Seated internal rotation. Sit on a chair, knee fixed, swing the foot outward to rotate the femur inward. Hold 20s, 5 per side.
- Pancake rocks. Sit in a wide straddle and rock the torso slowly side to side, then forward. Do not force the forward reach; keep the back flat.
Spend two weeks on rotation before you get impatient with the split itself. Most stalled side splits are rotation problems in disguise.
(y-) 2. The Adductor Stretches
- Frog stretch. On all fours, knees wide, ankles in line with knees, shins parallel. Tuck the pelvis. Rock gently back and forth for 10 slow reps, then hold at the deepest comfortable point for 60 seconds. If it pinches the front of the hip, widen the knees less and tuck harder.
- Straddle against a wall. Lie on your back with your legs up a wall in a straddle. Gravity does the work and you can stay there 3 to 5 minutes without effort. The best passive volume you can get.
- Cossack squats. Wide stance, sink onto one leg with the other straight. This is adductor length under load, which converts far better into kicks than a passive hold.
- Standing wide-stance slide. Feet wide on a smooth floor with socks, slowly slide out under control, hands on the floor or a chair for support. The closest thing to the split itself and the easiest to overdo. Go gently.
- Butterfly with PNF. Soles together, press the knees down. Push the knees up against your hands for 8 seconds at 60% effort, relax, exhale, press deeper. Three rounds.
(y-) 3. Strength at End Range
Passive side split range that you cannot control is close to useless for kicking, and it is the range most likely to get pulled. Load it.
- Copenhagen plank. Side plank with the top leg on a bench or chair, held by the inner thigh. Start with the knee supported, progress to the ankle. Build to 3 sets of 20 seconds per side. This is the best adductor strength exercise there is, and it substantially reduces groin strain risk.
- Adductor slides. Standing, one foot on a towel, slide it out and pull it back in under control. 8 per side.
- Straddle lift-offs. Sit in your widest straddle and lift one leg off the floor. It will barely move at first. That gap between your passive straddle and where you can lift to is exactly the gap between your split and your side kick height.
(y-) 4. The Progression Ladder
| Stage | Position | Target |
|---|---|---|
| 1 | Frog stretch, pelvis tucked | 60s comfortable, shins parallel |
| 2 | Wall straddle | 3 min passive, legs relaxed |
| 3 | Supported side split, hands on blocks | Sink 60s, hips under you |
| 4 | Side split with forearms down | Hold 60s, no shaking |
| 5 | Flat side split, knees rotated up | The middle split |
| 6 | Rotating toward neutral, knees forward | The true straddle |
Expect months per stage, not weeks. The side split moves on a different timescale to the front split and comparing them will only discourage you.
(y-) 5. Turning It Into Kick Height
- Slow side-kick raises. Chamber, extend to full height, hold 5 seconds, retract under control. 8 per leg. No swing at any point.
- Wall side-kick holds. Extend the side kick with a hand on the wall at maximum height, release the hand, hold 3 to 5 seconds.
- Rotated chamber drill. Practise the chamber alone with a deliberate hip rotation so the kicking hip stacks over the standing hip. Side kick height is a hip-rotation skill more than a flexibility one, and most people leave inches on the table by under-rotating.
(y-) 6. A 15-Minute Session
Post-training, warm:
- 90/90 switches, 10 slow.
- Frog stretch, 10 rocks then 60s hold.
- Butterfly PNF, 3 rounds.
- Supported side split on blocks, 60s, exhaling to sink.
- Wall straddle, 3 minutes, fully relaxed.
- Copenhagen plank, 3 x 20s per side.
Three to five times a week. The wall straddle is low enough cost to do daily, even on rest days.
(y-) Common Mistakes
- Arched lower back in the frog stretch. Kills the whole position. Tuck the tailbone.
- Toes pointing down in the split. Jams the femur into the socket rim and hides your real range.
- Forcing it with a partner pushing. The classic way to tear an adductor. External force with no feedback is how injuries happen.
- Pinching pain at the front of the hip. That is impingement, not a stretch. Back off, widen or narrow the angle, and check your pelvic position.
- Comparing to the front split. Different joint mechanics entirely. The side split is simply slower.
(y-) Sources
- National Strength and Conditioning Association (NSCA)
- American College of Sports Medicine (ACSM)
- Science of Taekwondo (Academic Studies)
(y-) Front Splits | (y-) Flexibility Warm-Up | (y-) Splits Progression | (y-) Stretching & Mobility
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