Definitely agree with this.  I ran track a looooong time ago in high school and we always had a warmup/cool down during practices.  I did sprints, 100m, 200m 400m relay.  I still ended up suffering a pulled hip-pointer muscle one time (it went out on me while running the 100m dash during a meet!) that killed the rest of that season for me.  Really sucked, especially since I was scheduled for 2 other events that day and I had to be scratched from those.  It was all I could do to hobble/walk for awhile, even had to use crutches to some extent.  Strangely, it didn't bother me again in my final 2 years after that, thank goodness.  But shin splints...that was a never-ending battle!  They had a shin splint board in the locker room that you were meant to stand on for some length of time (the board was elevated at about a 45 degree angle), to strengthen it.  And at home I'd have to occasionally lift a weight tied to my foot with my ankle (used one of those old cast irons, weight like 8 pounds!).  That helped a lot.