Do you know how your body functions during exercise?
1/ Achille
https://www.theglobeandmail.com/life/health-and-fitness/sore-achilles-things-have-to-get-worse-in-order-to-get-better/article551003/
https://bjsm.bmj.com/content/36/4/239
http://dx.doi.org/10.1136/bjsports-2019-100957
https://bjsm.bmj.com/content/54/8/444
Look at the protocol of this orthopaedic surgeon: Haran Alfredson.
https://bjsm.bmj.com/content/54/8/442?int_source=trendmd&int_medium=cpc&int_campaign=usage-042019