All yoga poses have names based on real life imagery. The instructors usually call out the Hindi, then translation, of half-moon, warrier, boat, etc. After any session which required some back strain, my instructor usually throws in what's known as Ananda Balasana, where you lie flat on your back, but grab your toes up in the air above you, knees bent.
See Zenas in his new move. In yoga it's called the Happy Baby.