Flexibility is very important in preventing injury. Stretching on it’s own is not a warm up and does not help prevent injury prior to a work out or game. In order to increase flexibility, you have to perform stretches 5-7 times per week. The best time to stretch is after your workout when your muscles are warm.
Educate yourself on a set of stretches for the following muscles and try and perform them daily.
Also, make sure to attend to any current or old injuries that you are might be dealing with by seeing a physiotherapist in your community. They can provide you with treatment and appropriate exercises for your injury in order for you to perform to at your best.