Sore legs.

This may be kind of a stupid question, but I'll go for it anyway.

I've recently started taking gym class (it's mandatory your first year of high school) and we have to run around a track, usually twice, every day. I'm not used to that much running, even if it's not all that much, and my legs hurt terribly. I keep getting bad pains in them. When I walk up or down stairs my ankles throb. I thought it might be because of my shoes (they weren't too supportive). But I got a new pair and it hasn't made much of a difference yet. We also stretch before we run so I don't think that would be a reason. So I'm just wondering, is this something I should be particularly concerned about? Will it go away in time, and is there anything I can do to prevent it?

Your legs will probably hurt until you get used to the running, mine always did. The aches come from oxygen circulating into new areas where it hasn't gone before, at least that was what I was told once. The pain will get better and the ankles will get better with time. Soaks in a warm to hot bath in the evenings will help the soreness. Deepen your stretches, lengthen them, too, gentley. Can't emphasize the stretches enough. Best of luck.