Recently i was searching some health related topics in hindi and found some quality material. There are some good websites providing health related material in hindi language. You can find valuable tips on Yoga, Ayurveda, Exercise, Diet and more.
Ayurved - an introduction to Ayurved, ayurvedic medicine and related therapies.
Yogvani - a good website on yoga. You can get tips on yog and pranayam here.
Reiky - Information about reiky and healing.
UNAIDS - Complete information about AIDS.
Webdunia health - Comprehensive information and tips about yog, pranayam, ayurved and health.