I thoroughly enjoyed learning from Scott Eaton in his digital Figure Sculpting course and gained a deeper appreciation for the musculoskeletal machines we walk around in every day.
The relationship between the collarbone, scapula, and shoulder blew my mind in their intricate dance of push and pull.

You can check out Scott's courses here. I highly recommend and his feedback on my sculpts was invaluable.
https://www.scott-eaton.com/digital-figure-sculpture