Leg muscle twitching

[kyro]

For the past month or so, my the muscle in my leg has been twitching at random intervals. It spasms for about 10-15 seconds, and then goes away. Anybody know if this is normal? FWIW, I use to run cross-country for a year or so, but I haven't seriously run for 3-4 years. Also, I have very tight muscles. I have a very hard time touching my toes, and I don't stretch regularly. Any knowledgeable information on the subject would be appreciated.