About 18 months ago I started doing a weights class once a week. I've progressed a bit but for the last few months have stuck to the same weights. A couple of days after each session I'm in agony with sore muscles, can't move normally. I thought this was meant to be something that happened only with new or increased activity?! Last week it was even worse having had a couple of weeks off over Xmas, but it was so bad I took some cocodamol because the pain was just awful.
Any ideas why this is and what I can do to stop it?! TIA