Give things away like your life depends on it. Practice being mindful of the happiness before giving, the happiness while giving, and the happiness after giving. For me, giving away my possessions and simplifying my life has created so much indescribable happiness and contentment and confidence.
Sometimes, getting out of the house for any reason is a wonderful way to reduce laziness/inertia.
How about finding a way to stand while on the computer rather than sit? I've seen a few people do this and they seem quite energetic.
Laugh a lot. I just attended a laughter yoga session a couple of days ago and it totally takes a person out of the stories for a while. In the car, just start pointing at yourself and laughing. Whenever you find yourself making elaborate plans or fantasizing about something, point at yourself and laugh. Pretend you are on the phone and somebody is telling you the funniest thing ever and start laughing. Pretend like you are riding a motorcycle around and start laughing. Laughter and smiling is such good medicine for the disease of seriousness.
Do some yoga. Relax, stretch.
Eat healthy, slowly, mindfully. Realize that you and the food are already one thing. That there is nobody inside consuming something on the outside. Easier said than done, but practicing this way is a wonderful way to realize that everything is just energy. Food has energy. Do you want a certain energy to become your energy? Which energies feel healthiest? Which energies do you crave but know are unhealthy for you?
Do Good, Avoid Evil, Purify the Mind.