If you have some time watch these programs. We have seen these challenges before but think us WD's will relate to this one. Take old bikes (many from our youth)and go tackle one of the most difficult trails in the US
https://www.youtube.com/playlist?list=PLQNbY8vNfRmWxvmA5Hk1o3CSh42bzLg4T
https://www.youtube.com/playlist?list=PLQNbY8vNfRmWxvmA5Hk1o3CSh42bzLg4T