Man boobs could be caused by having a high body fat percentage, or by having high estrogen. But in practice, losing fat helps with both of those things since it also lowers estrogen.
You definitely need more sleep, but you have a lot of room to improve on your diet too. Gotta cut out the sweets, and maybe alcohol too if you drink.
Stretching is pleasant up to a point, and still beneficial even without being taken to the point where it becomes painful. Mild stretching is kind of relaxing and good to do at night.
Add sex, sports and meditation to that list–there are actually quite a few health habits that are enjoyable.