I have long done static and dynamic stretches, after warming up first with light cardio for 5-8 minutes, and static stretching after playing. Just recently I purchased a foam roller to supplement my stretching and have used at night 4-5 times while watching T.V. Years ago I purchased a PNF strap and booklet, but do not currently use. The foam roller was working great until one day early in hitting balls I strained my quad muscle, which I have never done before, and believe it came about from the foam roller-is this possible? Did I do something wrong-too aggressive? If players do incorporate foam rollers and PNF stretching , along with static and dynamic stretches, how often do you do this and when-what is recommended?