Is this yoga? Really?

Yoga is for healing, not for showing how much you can twist your body or how weird poses you can do. Doing postures that don't suit your body may lead to serious injury, and most tough postures that some yoga teachers want you to achieve are not suited for most people.

Is this yoga, indeed? 
Such postures put a lot of concentrated pressure
on some parts and the heart.
I have culled out some postures from webpages, which, unless done by long-time yoga doers under expert supervision, can harm the yoga practitioner very badly.

As if standing on head at a beach
were not enough,she tries it on a stool!
Do yogic postures (asanas) and breath exercises (pranayamas) that go with your age, physical makeup, medical condition, and the weather.

PS: I have nothing against the postures given here or the websites or organisations encouraging practitioners to do these postures. I hope, these postures have been learnt by perfectly fit youth under supervision of medical and yoga experts.