The Inside Middle Block (also called an Inward Block, Middle Block, or momtong makgi) starts at the side of the body and moves to the center. The idea of this block is that (for example) if an attacker were aiming to punch you in the chest, this block would deflect the punch away from your chest. A similar block is the ITF-style Front Block.
- The blocking arm is chambered to the side of the body with the elbow bent upward, so that the fist's knuckles are pointing skyward. The palm of the fist is facing away from the body so that the fist will be able to rotate during the block.
- The non-block arm is aimed out in front of you, with the palm of the fist facing downward.
- The blocking arm is brought inward until the fist is centered on the chest, now with the palm of the fist facing the chest.
- The non-blocking arm, i.e., the off-arm, is simultaneously pulled back to the side at the waist, rotating the fist so that it finishes with the palm of the fist facing upward. One principle of taekwondo is the principle of action and reaction where if one arm is moving forward, the other arm should be moving back. The off-arm is providing the reaction for this block by moving backward and to the waist.
Variation: Knifehand Middle Block
In a Knifehand Middle Block, the block hand is held as a knifehand. This variation appears, for example, in the form Keumgang. As with a conventional Middle Block, the blocking surface is the inner forearm.
Variation: Inner Forearm Side Block
In an Inner Forearm Side Block, the blocking arm is chambered low to the side, then brought upward in an arc somewhat like the Middle Block, but stopping at the line of the arm's shoulder, rather than preceding all the way to the centerline of the body. This block appears, for example, in the form Hwa-Rang.