What is the main idea of "hit the ground running"?

Which sentence shows someone who has hit the ground running?

On her first day at the company, she hit the ground running by completing important projects

He hit the ground running and immediately took a nap.

They hit the ground running and forgot to check instructions.

Which scenario BEST illustrates the idea of “hit the ground running”

A student starts a new school year by excelling in classes and joining clubs.

A person sits idle on the first day of a project.

omeone tries something new and immediately fails.

Which phrase is closest in meaning to “hit the ground running”

"The new manager ______ by implementing strategies that increased sales from day one."