I want to know if this is normal, and will eventually go away, or if there might be something wrong.

I've been riding for about a month, about 50-60 miles a week. I'm not having any problems with cramping while I'm riding, usually because I'm not out that long to lose enough salt. Plus I'm adamant about stretching when I get done.

What I am noticing is that my legs feel constantly crampy and tired. Like when I walk up stairs, I get to the top and my legs feel like they just rode 45 miles. Or when I do the first thing in the morning yawn and stretch and all my muscles tense up, my legs tend to seize up and cramp for 10 seconds. Then all is fine.

So is this fairly normal when you start? Are my legs just trying to catch up, so they are going to be a bit wiggy for a while?