"If you were wondering how you might go about destroying the strongest and thickest tendon in your body, a simple way to achieve this feat would be to perform high rep box jumps. "

The title of this post was taken from a very interesting article about the risks of doing high repetition box jumps. While it is a bit "salty" in some of the various terms and language that they use, if you read the important parts it does put forth some interesting points.
This particular quote is quite startling: "Of note, 2011 Open Qualifier WOD 11.2 yielded an estimated 20-25 incidents of Achilles rupture."

Read the entire article here..........