Like we've said before, the hamstring is important for supporting the weight of the body. If something happens to it and it isn't able to support the torso, all the weight will fall on your knee. It isn't built to support all of the body's weight, so it will start to swell. If you experience this, it's best to call in sick and rest for a few days. Putting too much strain on the knees can have devastating consequences.

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