Ummmm, (and this is coming from a female) seriously ?! Your wife is telling you what you can and cannot do ?

Not everyone wants to be married to someone who spends all his spare time and energy in an event that only involves him. Maybe she would like to do something with him that would strengthen the marriage? That may sound strange in today's world but it could happen.

I've done 3 IM's when I was single and I wouldn't marry a woman who wanted to do Ironman triathlons. It's way too self-centred a sport.