What is metabolism and how does it work?

Can metabolism be 'fast' or 'slow'? Does a slow metabolism make us gain weight? Can you really "damage" your metabolism by following fad diets?

Muscle mass gain

How and why do muscles grow? How to develop skeletal muscles, what exercises to do, what to eat, when to train, when and for how long to rest…

How to speed up metabolism

Which of us girls has not dreamed of being able to eat everything and a lot and at the same time be herself, herself, herself… ..the most beautiful and herself, the slimmest…?