Tight hamstrings are a complaint of many athletes since they're often overworked and under stretched. Here's some things you may not have known about your hammys:

1. Your hamstring is actually made up of 3 different muscles. They run from your booty (sits bones) to the backs of your knees.
2. Tight hamstrings can be responsible for postural problems and back pain, because they tend to pull the hips and pelvis out of its normal position.
3. Your tight hamstrings may be your genetic destiny - you may have been born with naturally short hamstrings.
4. Sports and working out aren't the only causes of tight and shortened hamstrings - They can also be caused by sitting in a chair all day, which begins at the age of 5 or 6 when we first start school.
5. When you pull a hamstring, you've actually stretched the muscle fibers so much that they have torn. To prevent injuring yourself in the first place, stretch before and after your workout for at least 20 minutes - You don't want to end up like this guy...

I can't help but feel sorry for him even though his costume is a little ridiculous.