iyengar
n.— «Iyengar: Poses are typically performed slowly and held longer than in other schools of yoga, so close attention can be paid to precise muscular and skeletal alignment. Iyengar practitioners can use props or guides, such as blocks, straps or chairs to help align the body properly.» —“Styles to fit every aim” by R.J. Ignelzi Union-Tribune (San Diego, California) May 1, 2007. (source: Double-Tongued Dictionary)
I have always seen Iyengar yoga capitalized – it’s the surname of the originator, B.K.S. Iyengar.