strechting mussles and training them ok?

Hey, I wasn´t sure where to post this, this semed most logical. I was on msn with a friend again and the conversation went to working out. At one stage he commented that he doesn´t do any workout for his leggs. He started last year with karate so is concentrating on stretching his leggs. He asked if it is a problem if you workout your leggs en stretch them at the same time( as in same day, not in one exercise ). I don´t think it would be a prob but don´t realy know?

You shouldn't do hardcore static stretching before exercise but after it should be fine as far as i know

they should complement each other.