"to hit the ground running" what's the meaning of this slang?
eg. "you ready to hit the ground running?" what's the meaning thank you.

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To 'hit the ground running' is to start doing something that you have already prepared for, so that you do not waste any time once you begin.

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Neal has nailed the answer.  To "hit the ground running" implies previous preparation for an event or activity, enabling you continue with no interruption.  I believe the phrase originates from paratrooper soldiers, who almost literally have to do this after landing on the ground via parachute.

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spare no effort

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