What kinds of activities count toward a list?
List Hiker supports activities of all types, as long as the activity can be matched against peak and trail-segment locations.
List organizations generally require that you reach the peak and return under your own power. So for list tracking, hiking, trail running, walking, running, snowshoeing, and backcountry skiing are all fine — mountain biking would not be under such rules.
Accidentally recorded a hike as a bike ride? Don't worry — List Hiker will flag it and help you fix it.