I think people get upset because they are jealous! They want to be the ones that can do that to their body, they want something that means so much to them that they spend hours upon hours working on it, they want to be healthy and strong... I think trying to get others involved would really help them to be more supportive!

I know that when my GF first started training for tris, I was jealous. I thought that I could never do it and was amazed by how strong she was to be able to. Well, here I am with 2 duathlons under my belt and training for my first tri next season. Also training for a century ride and a 1/2 marathon. I remember telling her that I had no such desire to run more than a 5K. Ha! More like my brain trying to tell me that I wasn't good enough to do it.