What does muscle strength mean in calligraphy?

Personal understanding is that tendons represent toughness, meat represents softness, bones represent strength, and strength represents strength. Each calligrapher's personality and ideological characteristics are different, and the effect of writing is different. It is best to learn China's calligraphy from more calligraphers, feel their own characteristics, see which one suits them, and then deeply understand the calligrapher's personality, thoughts, temper and other things that belong to personal essence. If you are interested in this calligrapher, choose this one as an introductory copybook. In this case, we should not only learn what is exposed on the surface of bones and muscles, but also understand the characteristics of calligraphers through our own understanding, so as to learn to judge people by their appearances. Calligraphy is an art, and everyone has different understandings and opinions. I'm just saying here. thank you