Led by Indian Prime Minister Narendra Modi, tens of thousands of government officials, soldiers and students performed yoga in New Delhi Saturday for the first-ever International Day of Yoga.
In her new book, Michelle Goldberg traces the Western practice of yoga to a Russian woman named Indra Devi. Goldberg says that many of the poses in modern yoga can't be traced beyond 150 years ago.
The SmartMat is an intelligent yoga mat that records the user's movements and makes adjustments to improve yoga practice. The creators have a prototype and plan to ship the final product in July.