We are sure most of you already know this stretch, but we still had to post it as this stretch focuses on the upper leg and pevents long term knee problems.
How to do it?
We are assuming that you are stretching your left leg.
Place your right foot on the left side of your left leg
Your right leg is in front your left leg
Make sure your feet are parallel to each other
Place your feet as close as possible to each other
Now bend over and try to touch the floor with your fingers
Legs should stay straight through the whole exercise
You should now feel a stretch in the back of your upper leg, above the the back of your knee
Hold the stretch for atleast 30 seconds
Repeat for the other leg
A simple stretch, no complicated movements but still very effective. As one of us has shortened muscles in the upper leg, we can surely recommend this one to prevent you from long term injuries around the knee.