Hatha Yoga practice means the stubborn practice of yoga, without the interference of the five senses and the mind. Generally, people think of Hatha Yoga only as asana practice. But it is the austere practice of asana, pranayama, dharana, and dhyana to achieve the sublime state of samadhi. In samadhi the yogi becomes free from the illusion of form, time, and space. Asana is just one of the six practices in this path. Hatha Yoga originates from Raja Yoga. It is the simpler version (without Yamas and Niyamas) In simple words, you can say all the yoga poses and pranayama exercises can be classified as Hatha Yoga. So if you practice any yoga asanas or pranayama exercises you are practicing Hatha.