Mr Twinklemel has decided to take up running, got properly fitted for running shoes etc and all seemed to be going well.
However, last sunday he went out for an hour long cycle (fairly short for him), came home, changed into running gear and went out for his walk 1 min, run 1 min circuit, which takes around 20 mins for him to get round.
He came back in pain, saying that the muscles between his ankle and calf, up the back of his leg, had siezed up, getting tighter and tighter and they were visibly swollen when he returned home. They were sore for a couple of days after.
Any ideas what he's done wrong?