Long & Short lying and Short Sitting

Hi, I am a fourth year Pod student and this is my first post on here so please forgive my inexperience if I have not posted this to the correct area on this site. Anyway lets get to the point. Can anyone help me with understanding what muscles are not in use during each of the positions of Long Lying, Short Lying and Short Sitting

Hi, I am a fourth year Pod student and this is my first post on here so please forgive my inexperience if I have not posted this to the correct area on this site. Anyway lets get to the point. Can anyone help me with understanding what muscles are not in use during each of the positions of Long Lying, Short Lying and Short Sitting

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Long & Short lying and Short Sitting