I watched people who were great athletes turn all their muscle in to fat
Not to be picky, but muscle doesn't turn into fat. They are two distinct tissues and one cannot magically morph into another.
NAVYTOWN: the Witnesses don't worry about their health now, because they think all will be corrected in Paradise.
This is the core of the issue. It's the same mentality that keeps a JW from getting an education, having a career, planning for retirement, not having children, etc: The "New System" is coming anyday now, so taking care of their health is a waste of time.
I've been health conscious since I was a young teenager- I eat very healthy, workout everyday, etc. I have always been criticized by JWs for doing this for a couple of reasons:
1) time spent in the gym is time stolen from Jehovahâ„¢. Therefore, working out is selfish,
2) "Paradise" is right around the corner, no need to take care of my body, god will intervene soon. I won't live long enough to have any age-related (or poor lifestyle-related) health problems.
Well, guess what? The nearness of Armageddon, so no need to worry about it, when I began working out as a teenager was 33 years ago!