Biologically speaking, over the years, our tissues are changing in both directions, positive and negative. One of the reasons (except aging) for that is the way how we are treating them, especially muscle and fat tissue. Naturally, muscle mass is decreasing and fat mass increasing which we can relate with age, gender, physical activity and nutrition. To simplify, changing their correlation in positive direction (increasing muscle mass and decreasing fat mass) are one of the crucial directions to better health status, physical performance and esthetic impression. In Be Strong team, this training program is recommended to people which goal is to keep similar body weight, but to change correlation between muscle and fat tissue in same time. One of the important reasons for that goal is which body type client is (usually mesomorph).