1. Take an old dude, his daughter and his granddaughter. Pile them on top of a sled and push face first down a snowy hill.
2. Hit large bump on the way down the hill. When the sled finally stops at the bottom of the hill, hold side and moan in pain.
3. Enjoy the long hike up the hill as you are in an excruciating amount of pain. And remember. the ride was totally worth it.