My suggestion here would be:
Think about what is moving, how and where.
eg. His fist flew overhead. A boot appeared from the right and landed in his stomach.
You don't need technical terms. You can just describe the object, movement and location.
Short, simple sentences work best for action and fight scenes. If your sentences are too long, they lose speed and urgency to the reader, as if the character has all the time in the world to dodge out of the way.