Best thing to train Anatomy on, is a disarmed Gregorio. He's immune to damage unless you're on a specific quest, he's really easy to land hits on, and when he's disarmed, he also deals no damage. He spawns at a farm near the Ranger Huts outside of Skara Brae. He's also the best for training LJ on. Just get a fast wep and beat the hell out of him.