As far as drawing bodies from memory, it should be noted that Davinci was an art apprentice that would spend weeks just on the thumb, drawing it from different

As far as drawing bodies from memory, it should be noted that Davinci was an art apprentice that would spend weeks just on the thumb, drawing it from different angles. At the end of that kind of intensive training, I imagine (hardy-har-har) that being able to draw the body from memory would come as naturally as the skills professional athletes develop.