Remember that with your body, everything is connected!
Lets take a persistent hamstring injury as an example. It can often come down to a number of different muscle groups that are either hypertonic (tight and too strong - overworked) or hypotonic (long and too weak - underworked). 'Lower crossed syndrome' is a result of this, by which the lower back, hip flexors, quadriceps (front of your upper legs) and calves (back of your lower legs) become the dominant muscle groups.
This is usually a consequence of the way we live today - prolonged sitting in offices, on sofas, in cars, and not enough activity! As a result, the hamstrings, gluteus maximus (your bum!), abs and obliques (the side of your stomach) become weak and unsupportive; this is where the hamstrings become susceptible to injury.
Eradicating these imbalances is a slow process consisting of stretching your tight muscles, strengthening your weak muscles, using a foam roller to release adhesions in muscle tissue and generally creating a 'synergy' within your body with total strength in equal measure in all areas.
Have a think about your injuries and why you think they may have happened... You may be due some corrective exercise!