Because you exercise your muscles every day, you will find that the muscles of construction workers are somewhat chiseled but not big. The main reason is that the workers work many times without being exhausted. The bodybuilders in the gym mainly do muscle training with great weight, few times and exhaustion, and the results are different. Moreover, the workers' diet may be low in fat, as in protein, so the sebum is low, but it can't promote muscle volume.