I have tight calves which causes my heels to raise in squats against my will. I hate it!

I stretch my calves for about 5 mins before each workout now (I only recently found out it was my calves and not my form, I thought it was in my head), then do a quick stretch of my shoulders forwards and backwards, hamstrings, side bends, etc then I hit the weights. I combine it with either a few mins of cross-trainer, or just stretch a little longer and go straight to lifting.