Go to t - nation . com and look under authors. Click on Dave Tate and look for his article on box squatting. This helped me tremendously. Opening up your stance will decrease the ROM you have to fight through (which is a bitch if you are tall). The box will act as a ROM indicator so you know that you are going deep enough (another tough thing for tall people to do). The box squat also teaches you how to sit back and use your hip extensors (glutes and hamstrings) more efficiently. This will result in greater loads being used.