The standard male figure is an inverted trapezoid, so only the shoulders can be widened to reach this standard. The shoulder widens and the muscles increase, which makes it look like a tiger's back, giving people a strong feeling. The reason why boys want to make themselves stronger is because male hormones determine that men generally have the desire to protect women, and the way to make themselves look safer is to make their bodies bigger.
With such a figure, we can be more confident in front of disadvantaged girls. Imagine when a thin boy hugs a girl, if only that girl was thinner than him. If the girl is plump, the boy will be much thinner, which will make the girl feel that his arms are not wide enough to shelter from the wind and rain.
But personally, I really don't like men who love fitness. They are really squatting, their arms are almost as thick as thighs, and they look terrible and fierce. I really appreciate the figure I usually exercise, which makes people feel more natural and secure.
Therefore, it is not easy to get in good shape. You still need to find a professional coach to guide you, which can be achieved through proper exercise and proper diet.