Muscle exercise can make thin people strong and plump. The key for thin people to get fat is absorption. Some thin people eat a lot but can't absorb it well, so they don't gain weight easily. In addition, the metabolic consumption formed for a long time is greater than or equal to absorption, which is also the reason why they are not fat. Our goal is to change it, improve absorption function and change metabolism. This is a system, so don't expect to change it in a short time.