Core muscles that are responsible for the force of impact is: lats, press, delta. As mentioned earlier, to enhance the impact necessary to strengthen the muscles responsible for pivoting movement, strengthening kick.
To exercise lat perform lower links using weights or using a simulator for the lower links.
To study the oblique and lateral abdominal muscles put the bar on the bar on his shoulders and work out flapping in turn, make a turn only one body.
Strengthening deltas achieved by jerky movements in front of him. Optimally pick up the bar of the bar to alternately push it in front of him and over him. Also, a good exercise is the "Sledgehammer". It is as follows: on rubber tires, laid for depreciation and deal a blow with a hammer swing.
At home, you can also train strike using push-ups with a margin. Try to do this exercise as much as possible sharply. If at first you can not do push-ups with a margin, press at a normal pace a week or two, then move on to the push-clear of the floor, and then - with cotton.
A key role in training the force of impact plays practice and frequency of exercise. The more often, more and better you perform them, the stronger will be your kick.