While the usage of the word "Yoga" to describe spiritual practices is certainly quite old (the Yoga Sutras were apparently compiled a bit before Jesus), Hatha Y

While the usage of the word "Yoga" to describe spiritual practices is certainly quite old (the Yoga Sutras were apparently compiled a bit before Jesus), Hatha Yoga is only a few centuries old, and the gymnastic practice that is common today (asanas) is pretty modern (~150 years). Doesn't make patents any less ridiculous, of course.