I wish I could contribute more. It's extremely frustrating because I don't get much time out on the field. Also, I get hassled because I haven't gone through the drills, or been out there running wind sprints. For the last four years I've been harassed. His physical training has been vital, but there's much more than that.
Leg strength is certainly an aspect of being able to kick the ball well.
Technique is absolutely vital. It's a little like a golf swing. It requires pretty much the same mind set. Good kickers are able to put themselves into a blank zone that removes them from the obvious pressure of the moment. Handling the pressure is the paramount job of being a kicker.