I have alot of hobbies (motorcycles, gaming, flying RC, yoyoing, etc). I find the lack of motivation comes with everything i do. At first your all about it, then it becomes stale. I usually do what everyone else is saying, move on to something else and comeback later. I havent learned any new tricks in a couple months. But i still throw every day. I dont force myself, i just throw around the house when im bored or watching tv. You dont need to push yourself to have fun. Just do what your feelin.