It is correct to supplement beef after fitness. Beef is chosen because it contains more protein and less fat, so there is no special requirement on when to supplement it. You can pay attention to eating at lunch. In fact, it is best to supplement protein powder, milk and other high-protein substances after fitness, and it is best to supplement this effect after the fitness reaches your predetermined requirements and rests for 30 minutes. The interval should not be too long. The substances needed for muscle growth didn't work in time. .