Great video for what Japanese Interval Training is good (for all ages):
https://www3.nhk.or.jp/nhkworld/en/shows/2050153
However, training with a stopwatch is annoying, so I'm working on developing an Android app that tells you what to do, and when to do it, via speech cues, so you do not have to watch a screen.
My free Android app: https://tintwotin.itch.io/japanese-interval-walking
Password: motionjatak
Follow the installation instructions on that page. It's got 7 free sessions. It's a test version, so everything may not work yet.
Let me know what you think!
by tintwotin