While individual yoga teachers may adapt their own methods, several teachers have established well-known schools of yoga with an emphasis on hātha yoga postures (āsanas).
For example, B. K. S. Iyengar (1918-2014), systematized over 200 yoga postures.
In this practice, students gradually progress through different steps of complexity to insure that they do not strain themselves.
In developing this practice, he followed the basic eight aṅgas of ancient yoga, as articulated by Patañjali.
This modern yoga thus includes ancient practices like prāṇayāma (breathing exercises).