er, a few general pointers off the top of my head
- power depends on rotation and the kick begins when you step with your lead foot.
Dont step your foot out, plant it and then let it pivot as the kicking leg comes round. This removes some of your momentum.
Instead, as you step out, your kicking leg should be beginning its journey as soon as the stepping foot hits the floor. The stepping foot pivots as much as possible while the kicking leg travels out.
When you throw the kicking leg, begin by raising it as if you were throwing a long knee and give it that same push forward with your hips. This will add power to it and give it forward pressure rather than have it come in 'from the side' as many people do.
(If you look at pro MT practicioners, you will see that the kick has a forward bump of the hips in it; that comes from the hip pushing forwards like you do with a knee.) (PS i'm not talking about where they are throwing sets of 50 kicks on a pad, i mean where they are throwing power kicks)
if you are going to let the arm swing for added momentum (on the kicking leg side), turn the hand over as the arm swings back, so the knuckles brush across your ass, as it were. They teach this at sidyodtong (sorry sidyodtong if i am spilling beans here...)
This does two things - forces the hip to turn over (more power) and also brings the shoulder somewhat up over the jaw (more protection from a counter punch).