Muscular means involving or affecting your muscles.
As a general rule, all muscular effort is enhanced by breathing in as the effort is made.
一般规律是,肌肉的力量都是通过用力吸气来增强的。
If a person or their body is muscular, they are very fit and strong, and have firm muscles which are not covered with a lot of fat.
Like most female athletes, she was lean and muscular.
像大多数女运动员一样,她精瘦而健壮。