A possible concise summary is:
Carter and Stephen accept Roman Atwood's backflip challenge and try to do a backflip on a bike over a pond. They have to build a ramp, buy wood, and transport it on a small car. Carter attempts the backflip several times and finally succeeds, despite the cold water and the scary jump. They ask for thumbs up, comments, and subscriptions from their viewers.
Here are some key facts extracted from the text:
1. The text is a transcript of a YouTube video where Carter Sharer attempts to do a backflip challenge inspired by Roman Atwood and Travis Pastrana.
2. Carter uses a bike to jump off a seven-foot ramp into a pond and tries to do a backflip in the air.
3. Carter and his brother Stephen have to buy new wood from Home Depot to repair the ramp, which is old, rusty and rotted.
4. They have trouble fitting the wood in their car and end up wrapping it with plastic on the roof and the windshield.
5. The water in the pond is very cold and Carter says it hurts every time he goes in.
6. Carter fails to do a backflip on his first two attempts, but succeeds on his third one.