[hit] the ground running

to start doing something with a level of enthusiasm that leads one to make progress with great speed

She hit the ground running on her first day at the new job, impressing everyone with her efficiency.
To succeed in this industry, you’ll need to hit the ground running and adapt quickly.
The company hit the ground running after its merger, exceeding initial expectations.
When the new semester began, the students hit the ground running, eager to excel.
The team hit the ground running and won the first match.