I don't know another good site to buy the videos except Amazon, but collage was better than Amazon because of the clips and extensive reviews.
I would say that the two newest videos, the Remix and Party do both have all younger walkers all in shape pretty much. But I am not sure which videos have older walkers.
I did three miles from the Ultimate, blue, green and red. Plus the arm workout.
Hit goal of 150 on 2/21/2014.