Yak

Yaks are found on the island of Neitiznot. To access yaks, you must have started The Fremennik Isles and finished The Fremennik Trials. Yaks are very popular for training combat as they have very low defence and high hitpoints for their level.

Killing a yak will grant you 200 xp for the attack style you're training, plus 66.6 xp for hitpoints.