I woke up Thursday and my achilles tendon was kinda stiff. It got progressively sorer during the day and today it is really sore. I got a drs appointment and he told me I had achilles tendonitis, probably from over exsertion. I never knew that I had injured it, never felt a snap or a twist or anything like that. I have only been cycling since mid July and have been getting stronger and faster, seemingly each week. I was wondering if this is a common ailment for cyclists?