I think it would be great for the 'Run' challenges to also allow for 'Walk' to count towards getting the challenge badge for people who are less able-bodied. At the moment only Run, Virtual Run and Wheelchair are available. While this is fantastic for wheelchair users, it excludes people who aren't able to run but do not have mobility issues requiring a wheelchair. For example, I have a heart condition which means that it is actually quite an achievement for me to walk 10km in one activity and it would be nice to get a badge without having to pretend to run the distance required.