He is a great mountain biker, most notable for a series of epic stacks, involving lots of skinned elbows and knees.
This is reasonably well documented in his Youtube channel.
Currently working on a ~2m tube rocket which is expected to go in excess of 150m.
His activity in terms of rocket production is inversely proportional to the amount of school stuff he has to do (or directly proportional to his desire to procrastinate).