At the same time, starch is easy to ferment and produce gas in the stomach, and it will be very uncomfortable to eat before exercise.
If you want to gain weight, you should eat something with high protein content and a certain amount of fat, such as meat and bean products. You can ask me specifically and I'll answer.
Note: Baked sweet potato tastes good, but attention should be paid to hygiene problems. There are many hepatitis B.