Training Camp and preseason isn't meant to get a player into shape. They should already have their conditioning pretty well maintained, and camp helps fine tune the conditioning to game condition. It is not designed to undo an entire offseason of being an out of shape slug. Dion has started multiple REGULAR seasons out of shape and looking sluggish and slow. As the seasons progressed he slowly got better and better as he was getting into better shape. There are ways to keep weight up during the season, just as there are ways to not show up completely out of shape when camp starts... (FYI, this has nothing to do with his athletic freakishness)