Arm and wrist muscle resource

Does anyone have a good resource (youtube, website or book etc) to help learn about the individual muscles that move the hand and wrist? I’ve found this site, but would love to see what others have used…everything help. I’m a total ‘from the ground up’ learner. Also, happy new year to all! May the new year bring you closer to feeling like your guitar is an extension of your arm.

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