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Effektiveness of training with the book / App

A study of the Department of Sports Science of the Univeristy of Tuebingen, Germany showed, that the exercises caused an improvement in 76% of the body areas by 52% on average.

Walz H. Bachelorarbeit: Der Wirbelsäulen-Fitness-Check
Seine Effektivität als Diagnose- und Therapieinstrument, altersabhängige Entwicklung von Wirbelsäulenfitness und geschlechtsabhängige Unterschiede.

A swiss study on spinal posture of high school students during lessons showed, that the training caused the students to go from 45% to 67% sitting upright: Obrist J. Maturitätsarbeit.