I've heard players (mainly in NFL) complaining about the current field surfaces and saying everything should be natural grass. I thought the field turf was supposed to be good for the players. I understand what was going on with the old Astroturf. It had seams in it that if your stepped in would destroy a knee. What is it about natural grass that is better than the field turf? I'm not complaining, I'm just not smart enough to know why it's so bad.