It's supposed to be an act of bravery, a way of leaping into the unknown, tethered only by your own faith that you will make it. That's what letting go is.
Most times you have to edge up to it, test the waters before you decide not to drown. But sometimes, on rare occasions, everything in your body will tell you that the time is right, and you have no choice but to suck in that last deep breath of air, and let your body relax into the momentum of your jump. While you hang there, suspended in the air for a fraction of a second, you know that nothing could go right. You also know that nothing could go wrong. You've no choice but to let it happen.
An act of bravery is living.