Our expert says:
THis sounds very much like your hamstring tendon, but it is better for you to have someone have a look at it ,to accurately diagnose your problem. From the sounds of things the increase in speed training has probably led to a mild hamstring strain and you need to slow things down until the symptoms subside. For rehab, some eccentric loading of the hamstring will prevent this kind of thing from happening again. Run flat and slower until the discomfort goes and then slowly increase speed by 10% a week. Yours in running.
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