 Yoga reached London's evening classes in 1967.The Inner London Education Authority (ILEA) stated that classes in "Hatha Yoga (sic)" should not cover the philosophy of Yoga, favouring "Keep Fit" classes in asanas and "pranayamas (sic)" especially for people aged over 40, and expressing concern about the risk of "exhibitionism" and the lack of suitably qualified teachers.The ILEA's Peter McIntosh watched some classes taught by B. K. S. Iyengar, was impressed by his 1966 book "Light on Yoga", and from 1970 ILEA-approved yoga teacher training was run by one of Iyengar's pupils, Silva Mehta.