I have two thoughs on this...
try stretching your hip flexors. If you don't know what they are just google it.
However, I don't think that is what your coach meant. I have heard coaches tell a bunch of guys that there hips are to tight but they never meant stretching wise. More often than not, they are referring to the fact that you don't open your hips enough when you are in a back pedal or you don't have enough fluid motion in your cuts. In other words, your hips are "tight," or don't move quickly enough. That would be my guess to what he meant.
I could be wrong though.
__________________ Strength is understanding that your power is both physical and emotional. - Henry Rollins |