I am STILL doing 5 mile rides 80 miles after I started riding my bike. I never have a problem with my legs, and my avg. mph is getting higher each week. If anything, my calves are a little tight, but no spasms yet. I also stretch out my legs in all ways before riding. My DH is a former elite distance runner, so he really gets on to me about stretching before and after rides. Hope your legs feel better soon!