The size of the skeleton is natural. If you want to be big, you can only start with fitness and muscle training, increase the amount of exercise and stimulate your muscles repeatedly. Being burly is directly proportional to your weight, so you need to increase your appetite and eat more high-protein foods, such as beef, milk, chicken and protein powder. These must be lean meat, and vegetables and fruits need to be supplemented. In muscle training, I have always been heavy, multi-group, low frequency. I use dumbbells and exercise with fitness equipment. I have been doing push-ups for two years. I hope you can stick to it. If in doubt, you can ask.