The side kick (yeop chagi) drives the heel or the outer edge of the foot (balnal) straight out to the side. The whole body lines up behind it, head, hip, and heel on one line, so a lot of body mass goes into the target. That is why it shows up so often in board breaking.
In sparring it shows up mostly off the front leg, as a jab with the foot: a long, straight kick that stops an opponent walking in and scores two on the trunk protector.
(y-) Mental model
Picture yourself as a ruler turned on its side. The kick is good when the ruler is straight from the head to the heel and pushes through the target. If the hips stay facing forward, the ruler is bent at the waist and the kick turns into a weak, sideways front kick.
(y-) Step by step
Front leg, from a sparring stance.
- Slide the rear foot up toward the front foot so your weight shifts onto it.
- Lift the front knee across your body, foot pulled in near the opposite knee. The sole of the foot faces the target.
- Pivot on the support foot until its heel points at the target. This turns the hips over and is the step most people skip.
- Extend the leg straight out, heel first, foot flexed so the edge and heel lead. Your head, hip, and heel finish on one line.
- Retract the knee back to the chamber and set the foot down in front of you, still in range.
(y-) Technique notes
- The support heel decides how good the kick is. If it does not turn toward the target, the hip cannot turn over, and the kick lands with the side of the foot instead of the heel.
- Flex the foot and pull the toes back. Striking with the sole flat spreads the force out and is easy to push away.
- Lean the upper body away from the kick, but keep the eyes over the shoulder on the target. Leaning back too far drops the hands and kills the follow-up.
- Chamber tight. A wide, swinging chamber gives the opponent half a second to see the kick and step off the line.
(y-) Variations
| Variation | How it works | When it helps |
|---|---|---|
| Front-leg side kick | Slide up, chamber, kick. The fastest version. | Stopping an opponent who steps in, controlling range. |
| Back-leg side kick | The rear leg turns through, the body rotates fully side-on. | Power. Pad work and breaking more than sparring. |
| Jumping side kick | Step and jump, chamber in the air, kick at the peak. | Closing a long distance. Mostly a demonstration kick. |
| Side kick fake | Show the side chamber, then turn it into a roundhouse or an axe kick to the head. | Drawing the guard down, as described on the (y-) Sparring page. |
(y-) Where it fits in sparring
The front-leg side kick is a range tool. Fighters who like to rush in with a back-leg roundhouse have to cross the distance where your front leg is already pointing at them. A side kick into that step either scores or makes them stop, and both are useful. It pairs well with the cut kick: both use the front leg to control the space in front of you, and the side kick reaches further.
Inside the clinch it does nothing, and against a fighter who circles to your back side it misses.
(y-) Flexibility and strength
Side kick height depends on hip abduction range and on strength in the glute of the kicking leg. If you can sit in a wide straddle but cannot hold the leg up at chest height, the missing piece is active strength. The (y-) Side Splits page covers both.
(y-) Progression drills
| Stage | Drill |
|---|---|
| 1 | Chair or wall support. Hold a wall, chamber, pivot the support foot, extend slowly, hold two seconds, retract. Five per leg. |
| 2 | Chamber-to-extension holds. No support, extend and hold the leg at belt height for three seconds. |
| 3 | Heavy bag. Front-leg side kicks with a slide-up. Listen for a thud, not a slap. |
| 4 | Moving target. Partner walks forward holding a kick shield. Time the side kick to land as their front foot steps. |
| 5 | Fake and switch. Show the side chamber three times, then turn it into a roundhouse to the head on the fourth. |
(y-) Common mistakes
| Mistake | Fix |
|---|---|
| Support foot does not pivot | Drill the pivot slowly against a wall until the heel turns without thinking. |
| Hitting with the sole or toes | Flex the foot and lead with the heel. Check where the pad mark is. |
| Bent at the waist | Turn the hip over and line up head, hip, and heel. Film it from the front. |
| Swinging chamber | Keep the knee tight across the body before extending. |
| Landing far away | Put the foot down in front of you so you are still in range for the next kick. |
Sources
(y-) Front Kick | (y-) Cut & Push Kick | (y-) Sparring | (y-) Side Splits
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