"The Walk" App Adaptive Difficulty

amusedmonkey

I've purchased the app when it was on discount and so far I've done 2 maps, which was weirdly fun. Now the third map is a challenge, you are supposed to collect as many "thingies" as possible. In the settings, there is an option which enables "adaptive difficulty" adjusting the challenge to your fitness level. I'm wondering how they determine your fitness level, you cannot choose your own level. Has anyone experimented with that?