Heavy Bag - Muay Thai Knees

CombatBag

Muay Thai-style knee strikes to the heavy bag, driving the knee upward and through the bag using hip thrust and a pulling motion with the arms (simulating a clinch pull) — essential for MMA clinch work and Thai boxing conditioning.

Demo: Muay Thai heavy bag training

Sets

4

Reps

45s on / 15s rest intervals

Rest

15s

Contraindications

Hip flexor strain risk with high volume — build up gradually.

Setup

Close range to the bag, as if in a clinch, hands positioned as if gripping an opponent's head/neck.

Execution

  1. 1Drive the knee upward and forward, leading with the kneecap
  2. 2Simultaneously pull down and in with both hands as if controlling a clinch
  3. 3Snap the hips forward on impact, driving through the target
  4. 4Alternate the base leg or hop between knees for continuous output
  5. 5Keep the head up and chin tucked throughout

Key cues

  • Pull the target into the knee, don't just lift the knee alone
  • Drive through with the hips, not just the leg
  • Hit the same spot on the bag consistently to build accuracy
  • Stay on the balls of the feet for quick knee changes
  • Exhale sharply on each knee strike

Common faults

  • Lifting the knee without any hip drive or pull
  • Losing balance and falling forward into the bag
  • Not alternating knees, causing one-sided fatigue
  • Dropping the head down instead of keeping it up and tucked
  • Striking with the point of the knee inconsistently, missing the target

Tweaks

  • Add a skip-knee rhythm (hop between each knee)
  • Combine with straight punches before the knee (jab-cross-knee)
  • Side-skip knees, changing angle before each strike

Muscles

Primary: Hip Flexors, Glutes, Core

Secondary: Quadriceps, Forearms

Notes

Firas Zahabi's Tristar system incorporates Thai knees extensively for MMA clinch and cage work — this drill is a direct crossover for combat-focused S&C programs.

Sources

Attribution: Muay Thai coaching community