I love chunky gliders! You might try hiding treats in the bathroom/tent so he has to 'forage' for his food. This will give him exercise. Once he catches on, he will keep looking for treats even when they are all gone!
I admit to over indulging Sissy and Beau with giant mealworms, lately. Every time I make a "kissing" sound, I give them a worm. Now, they actually come to me whenever I make that sound! It is very helpful on those occasions when they wander off under a sofa or bed. BUT -- the down side to this training is that they have become kind-of portly.
The kissy noise is a good idea, now if I can make it work.