Boys are on a hike today. If son #1 completes a few more things, he will earn First Class before summer camp (#3, he's 13). Son #2 completed the Swimming merit badge. We are encouraging them to log for Personal Fitness over summer vacation.
The Scouts in my son's troop don't have difficulty doing fitness activities, they have difficulty tracking their fitness activities. I don't know why. Is the tracking too much like school?
Introduce technology to them. Have them track it on their phones, then on paper. There are many apps you could use or even Google sheets app and fill it in.
Brian, I will suggest that to some of the parents. Maybe an app (something like Habitica) will help them. Some of them do not have phones yet, but they could borrow a parent's phone for a minute or so every day. Thank you for the idea!