I can confirm the Genius of Paramhansa Yogananda in devising these exercises. The innovation is not in the calisthenics themselves, rather in the conscious control of life energy which is employed by muscle tensing to revitalize all bodily parts.
Brother Turiyanada on the:
ENERGIZATION EXERCISES
1 The mind has to be convinced about energization.
2 All of us have disease in our bodies, minds and our emotions. We must get over it by energization.
3 You are working on your physical, astral and causal bodies in the exercises. Disease has to be removed by the harmony of all three bodies.
4 What is will power? There are two parts:
a desire
b enthusiasm- the greatest conductor of will power in your spiritual life.
5 Problems develop from underaction or overaction of life energy.
6 To become spiritual involves biological regeneration. The attention at the C.C. is vitally important in order to draw in the lifetronic energy that heals.
7 You must do every exercise with devotion.
8 EE helps to transcend body identification, energy identification and thought identification. There is a definite re-engineering at the cellular level to get us ready for the cosmic current.
9 "When doing the Recharging Exercises, invoke a reverential feeling. God Himself has given these exercises to Guruji. You are to be embraced by God as Christ Energy."