jumpingbeans
You're friend is a bit behind the times on this one.
Recent study out of Japan shows 3 minutes of 70% top speed walking, then 3 minutes of normal speed walking, in 5 sets for a total of 30 minutes of walking has better health results than 10k steps.
Also, I've found that suggesting 30 minutes of walking vs ??? minutes of walking to get 10k steps is easier for most people to fold into their schedule.
That said, walk as much as you can. If you live in a city, walk to wherever you need to be.
You sent me down a rabbit hole. In trying to track it down for myself I read a couple of others that I thought might be it, and was stunned by how obtuse these patents are.
What sort of leverage does this stuff provide? You mentioned "charge rent". What does that look like?
Do you have a link to the patent?