If you eat meat, mainly sheep, cattle, fish and skinless poultry, try to avoid pork.
Strong and fat are two concepts. In theory, people can have unlimited fat, but their muscles are different. A strong person does not mean that he has more muscles than the average person, but that his muscle fibers are stronger than the average person. Moderate exercise and a reasonable diet can make you stronger, but for the specific amount of exercise and exercise methods, I suggest you read more relevant materials and customize your exercise plan according to your physical condition.