He may be depressed, and I've actually brought that up with others who have also tried to encourage him to change his behavior (I work with several shitlords that are very supportive when someone wants to get in better shape). We've all pretty much determined that unless he brings it up to us and wants support, there's nothing much we can do. He just turns his phone on silent and naps or games, and can't be reached. I'm not the first person he's stood up. Funny thing is, a couple people who he avoids now are people who he encouraged to get into better shape just a few years ago. Now they're ripped, and he's round.  I'll help if he asks for it, but I won't waste my time if he's not going to take the initiative.