There is no saying that carbohydrates are supplemented immediately after training. Strong man, semi-professional for at least many years, never heard of it. It is the short-term weight gain that is unreasonable to gain weight, so the actors will practice. Most trainers just need to eat more at ordinary times, and the part that wants to gain weight is to add brown rice and cheese to their usual eating habits. A series of products such as protein powder are just supplements. Even a spoonful of protein powder is top-notch chicken breast. It takes a long time to take food to the gym for training.
If muscles are often in a state of fatigue, change the drinking water during training to saline with a concentration lower than 50% of normal saline. If it is not enough, add creatine monohydrate. Bananas can quickly replenish physical strength.