Its the back foot that is your distance, by moving your front foot after youre bringing your Head nearer to the other guys range. Its a bad habit, theres a few ways of solving it, as strange as they may seem. Heres one, on your front foot wear a Rollorskate, it will put you on your back foot, being higher than it. Plus if you put to much weight on it you will go arse over tit . It a great way of mastering Proreceptive skills.