Maxalding and muscle control

Going back to my youth, no internet but much mail order courses, such as Charles Atlas Dynamic Tension System or Maxalding.

Maxalding has many similarities to Yoga.

https://www.webarchive.org.uk/wayback/archive/20110421114608/http://www.maxalding.co.uk/exercises/exercises.htm

reproduced Maxalding courses

https://www.webarchive.org.uk/wayback/archive/20110421115107/http://www.maxalding.co.uk/Strength%20and%20Development%20Course/strength%20and%20dev%20index.htm

I remember sending off for  the Dynamic Tension and Maxalding courses, and have some old Charles Atlas courses.