Someone who knows more about anatomy than anyone I've ever met once said to me: "Half of all yoga poses are great if done correctly, and half of them should nev

Someone who knows more about anatomy than anyone I've ever met once said to me: "Half of all yoga poses are great if done correctly, and half of them should never be done by anyone." He mentioned the pigeon pose as a particular instance of a pose that may feel like it's "opening you up" but which, if you're doing it perfectly, is stretching something (hip ligaments) that don't need to - and shouldn't - be stretched. EDIT: Downvoter, if you know otherwise, please educate me!