What I liked: you read, you apply, the book frames you well and give you only the information that will enable you to take action. You do not need to wander in the theory for 3 weeks before you can take action. And then the author sets out on his blog the scientific basis of its approach to those who want to deepen or make changes. And it is very comprehensive, it is to develop multiple capacities: endurance, relaxation, strength, flexibility. And it nempêche not to "take the mass" on the contrary.