Keeping my elbow tight, I prepare to drive the fist up through the jaw area of my my target. My weight shifts forward.
To execute the punch, I drive my fist up through the chin region.
The reverse hand upper cut is more powerful. The technique is the same, except I twist my body across to reach the target. My weight is rooted to the front foot as I lean in.
The non punching hand is used to guard the side of the face, usually against hook punches. I should try not to overlean, to maintain power and stability.
The lead hand uppercut can be hard to hit with power. I should keep the punch tight, opening out the body via the hips slightly to increase power. I can also drive through the front heel.
I use the full power of the hips and shoulder to drive directly upwards through the target.