Hello. I got a walkpad a month or so ago (it's a small treadmill) and I try to walk 1hr per day daily for health.
As far as making the most of this otherwise boring workout I have found it helps to play relaxing games on my CRT. I have a PC but lean more towards pre 2005 games (it's not a limit though).
I mention the treadmill because the games have to be engaging but not require 100% of your attention. For example I finished Resident Evil 1 the other day. It was a wonderful game although it had a lot of backtracking which was annoying.
A bad example would be Megaman 1 (too strenuous and attention requiring, also brutal)
A good example would be civ2 on the PS1.
In terms of what games I can play, I can pretty much play everything up to 2005 either handheld or console up to that time. I have a PC/ 3DS/ Analogue Pocket.
I lean towards pre 2005 games but not limited to that. I don't really have any specific genres in mind so you can recommend whatever you want and enjoy.
There's several videos on getting it to run on windows 10 on youtube, however I think the best way to play NFS Porsche is on an old computer. And a CRT monitor.