I don't know anything about that app. My neighbor was trying to motivate her elem aged son and found some virtual walking/running famous sites challenges. Like this one: https://www.theconqueror.events/ringofkerry/
Now her son can hardly wait to get out and get to the next check point. he enjoys telling me how many miles he's gotten up to.

maybe a virtual challenge would work for you?

here's some i found googling:
https://www.myvirtualmission.com/
https://worldwalking.org/walks/explore
https://www.theconqueror.events/
https://www.theconqueror.events/appa...ual-challenge/