The moment before you jump
There's a moment before you jump, a moment of preparation when your muscles contract and your body pulls into position. A moment when the jump exists somewhere between your mind and your muscles. Nothing has happened yet; but it would take more energy to stop it from happening than it would to simply
And why would you want to jump? Why would you want a burst of acceleration and movement to move you from where you are now, through the air, to land back here again or to move forward?
Would jump because it feels good? Would you jump because you crave that moment when you defy gravity? Would you jump because a large object is on a crash course with you?
Once your muscles are coiled and ready, it will be easier to jump than to stop yourself.