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shape up

 
See:
shape
part of speech: phrase
definition 1: to take form in a certain way.
Our project is shaping up nicely.
definition 2: to improve one's behavior or performance to match a certain standard.
The boss said that, if she doesn't shape up, he'll fire her.
definition 3: to improve one's physical fitness.
When I discovered I couldn't even run a few blocks, I decided it was time for me to shape up.