The first point about this tip of hitting into a firm left side is obviously this is for a right handed golfer flip all this information around for the left hander. So as a golfer we want to hit into the firm left side or playing right handed because the left side is going to be a front side and we want to have a little bit of restriction or certainly resistance against this front leg.
Techniques for hitting in to a firm left side in golf (Video) - Lesson by PGA Pro Pete Styles