I agree with Yasmin. I'm a triathlete, but still wasn't much of a runner, and when I started to train for a 1/2 and full marathon this summer, I got shin splints. I read up on it and realized I was running too fast, too soon. My heart and lungs could barely stand it, either. I iced my shins and took Motrin, and when I started running again, I ran as slowly as possible. Gradually built up to my current snail-like pace. I hope to build both endurance and speed. I run mostly on concrete, in my neighborhood. My biggest injury this summer was when I tripped on a broken piece of sidewalk, and skinned the *&$#+@* out of both knees and palms!

Go slow and build up--and have fun with your duathlon!

Lise