1, fitness is necessary to supplement protein. Protein is a "material" and a necessity for repairing damaged muscle fibers. Protein-containing foods mainly include beef, chicken breast, eggs, milk, fish and shrimp.

2. Beef is one of the most abundant foods in protein. In addition, it also contains zinc, a small amount of creatine and vitamins necessary for fitness. This is not available in many other high-protein foods.

3. Fitness people need to consume 1.5-2.0 times of their body weight every day. Without protein, the fitness effect will be greatly hindered. So it is ok to eat beef every day.

4. In addition to beef, you can add some protein powder if possible, which can supplement protein more conveniently.