Looking for feedback, completely got lost with Proko's explanation in the video. Tried my best to replicate the tracing. Any advice in how to memorize muscles groups.

The tracing exercise is all great, but it's really hard to translate into other irl models, or use in personal works. I feel like there's a step missing before this starting tracing. Also It's hard to find references that would group muscles that would keep simple for artists. Any suggestion in how to digest anatomy? Been struggling on this particular topic.