An idiom you can use:
to be getting [x] at [something].
He is getting good at lying.
He is getting good at it. it=lying
They are getting lazy at it.
They are getting lazy at playing tennis.
to get [good, lazy, quick, etc.] is the first part of the idiom which means: to become good, lazy or quick
at should be followed by a verb phrase and that verb phrase, if the context is known, can become simply it.
- I think I am getting good at explaining these idioms.
- I think I am getting good at it.
- But I may soon get lazy at it. [explaining these idioms]
[The last examples are a joke used to make my point.]