1. Don't do anything. Nothing. For a long time.
2. Sit a lot.
3. Even better, lay a lot.
4. Sleep. A LOT.
5. Don't put on clothes or do laundry.
6. Eat, but nothing that requires effort. Cereal right out of the box is good.
I think that's it.
Here you have it, folks who desire to be lazy. Stop being productive and having fun and doing things with your life! Just stop and do nothing. Woohoo laziness!