翅
As you climb, your back begins to itch. You take off your shirt to dry off more easily, and use it to mop up your sweat. After what feels like hours - you can't tell; it all feels like a blur if you think about it for too long, and the sun is as high as it was when you started - you reach the mountain peak. The horizon stretches out before you, and if you peer downward, you see the field that you just left.
Out of the corner of your eye, you see a flash of white. You turn your head to look at it and realize they are feathers: pure white feathers, on wings that are growing from your back. They flutter as you stare. You give them an experimental flap and they lift you off the ground. You can feel every tiny breeze blowing through your wings, and as you rise higher and higher, you find that flying feels as easy as breathing.