When working out not necessarily all people should eat protein powder, according to the needs of fitness to choose. If fitness is to achieve muscle growth, bodybuilding purposes, then you can supplement some protein after fitness, especially beef, which is rich in protein, supplemental protein can promote muscle growth, to achieve the purpose of muscle building. If you have the conditions, you can eat protein powder, protein powder is more convenient and easy to obtain, the disadvantage is that the price is more expensive. If the fitness is to lose weight, then there is no need to eat protein powder, in order to lose weight fitness, fitness after eating some vegetables and fruits and a small amount of staple food can be. If the fitness is to exercise, improve physical fitness, improve cardiorespiratory function, then there is no need to eat protein powder, only to achieve the purpose of muscle building people, need to eat protein powder.