I found your experience re the bodybuilding side of it rather puzzling, especially the purported directive from bethel that it is not ok if it is just a 'hobby'.
There is a friend in my former congo who i have known for years. He has never had many 'privileges' and has never sought to be a MS or elder, mainly cause he's just not the type and has always been a bit on the weaker side, but he has been majorly into bodybuilding for about 20 years now, and he has never had any trouble with the elders, except about 15 years ago when he was about 20 and got quite unbalanced with it, to the point of entering a competition for his region (where he came second). the elders had a wee chat and said he may be taking it a bit too seriously. He knew he was and backed off with the competition side of it, but frequents a local gym 3 times a week, talks a lot about it with other brothers quite a bit, and even works out with some of hte other younger bro's at him home where he has a lot of equipment. this brother is much loved by everyone and has never had any trouble since that time 15 years ago relating to his bodybuilding. You can tell he works out a lot cause he has massive arms and a large chest.
I also had an ex girlfriend in the truth who had an older brother who was in fact an elder, and who for years had done a lot of weight-training and body building. He had his own gym set up at home, and was quite big.
so it looks to me like the elders in your situation have adopted a pharasaic like attitude to your husband's 'hobby', and have gone beyond common sense, reasonable, and the scriptures in this regard. The bible does say it is beneficial 'for a little' so what could be healthier than a brother doing some bodybuilding, as long as it is not affecting him spiritually. It is in fact a great form of sublimation for all those randy young brothers trying to release some testosterone in healthy, morally safe ways. There was an article recently in one of hte Awake's I think about bodybuilding too, which i'm sure you've looked at.
But are you telling us the whole story? Was your husband entering competitions? Even if he did that is a conscience thing of course, and certainly no elders should be coming down on him for that even.