A booklet that is worth its price many times over.
Basic idea: Achieve a lot with little effort.
About 15 minutes a day is enough to start the day fresh.
Simple, but proven exercises without sports equipment.
About the author:
Winfried Kassera, born in 1942, active in gliding since the age of 14 and with 19 one of the youngest German motor pilots, is a glider instructor, a recognized expert and examination council at an aviation office. His main job is teaching mathematics and physics at a secondary school.