The biggest habit which I find when coming down on the ball is that I tend to lift up my back heel on the downswing before making contact with the ball. I don't know what lifting the heel does, but many have told me to keep it down on the ground before making contact with the ball. I've always had this habit, and I think it's from playing baseball pretty much my entire life. So basically I'm asking if anyone else has this problem, and what exactly does it harm by doing this habit, and how can I fix it? I've always had the mentality of keeping my foot planted, but even when I think it is, I return to the video and still find that back heel coming up.