This is the 3007th most frequent Chinese word.
肌肉
Muscle.
In this sentence, '肌肉' refers to the physical aspect of muscles in the body that can be trained and increased through exercise.
我最近每天健身，以增加我的肌肉。
I have been working out every day recently to increase my muscles.
Here, '肌肉' is used to emphasize the strength provided by the muscles, showcasing their functional capability.
他的肌肉力量很强，可以举起很重的东西。
His muscle strength is very strong, and he can lift very heavy objects.
In this instance, '肌肉' describes the control and coordination of muscles in performing physical actions.