How about "stop [acting] lazy"? 'Acting' has more of an implication of something you are putting on that can be easily changed, rather than 'being' which possibly implies something you are, that is not easily changed.
This is deeper down a rabbit hole than I really meant to go, but I personally think "being lazy" is appropriate; I spend time being lazy pretty often, and it isn't an act, it's true laziness, but it's also temporary.