Iyengar: Symmetry and alignment B.K.S. Iyengar developed this yoga style, which stresses understanding the body and how it works. Students focus on symmetry and alignment, using props â€” such as straps, blankets, wooden blocks, and chairs â€” to achieve postures. Each pose is held for a longer amount of time than in most other yoga styles. Teachers of this discipline must go through an intense, long, and rigorous training program.