He seems to be way too rigid and narrow minded about this. I don't know about other areas but in all honesty he sounds very much like someone that is trying to make you into something you are not. It's never a good thing to force your interests on an unwilling partner, be it a friend, wife, gf etc. I don't understand this thinking at all.

So what if it doesn't make you sweat? He's focused on himself and sounds very selfish, if it doesn't please him and his needs to be an exercisoholic then it's not good enough for him. I thought this was about you SHARING something together not all about him and his needs and you tagging along and going "yes dear, it's fun."