<human>: I should start this by saying that I love my boyfriend dearly. This is the longest relationship I've ever been in and he was the first person I ever told "I love you" to. I don't see this relationship ending. We have unnatural chemistry and he's an amazing support system. 

However, there is one thing that is bothering me--his health and lack of exercise. In high school my bf used to be a star athlete and in the best shape physically. For his own reasons, he decided not to continue with sports in college. We can just say that he let himself go. He doesn't watch what he eats and doesn't exercise regularly. I met him in the aftermath of all of this. 

Health is very important to me. I struggled with my weight for many years before becoming fully committed. It was something I had to do and did by myself. I was obviously drawn to my bf by other things and that has grown into a relationship that makes me happy. So my question is, how do I address the issue I have with his weight, health, and exercise? This is a very sensitive subject, however, I just want to see him care about these things.

Condense the text into a few key points
<bot>: In a committed relationship with my bf, however his lack of exercise is an issue. How do I approach this problem or motivate him to work out more and take better care of himself?