Sir: I am glad that people across the globe celebrate June 21 as International Yoga Day. We can say with pride that yoga, which is a way of life for many, has its origins in India and has spread its wings across the world. But sadly it is still often incorrectly linked with religion. Yoga is a complete science of human health and wellbeing, which integrates the body, mind and soul together. It is said, “Gym is for the hardware (body) and yoga is for the software (mind).” Today’s youth need to benefit from the power of yoga and they should become spiritually dynamic instead of being addicted to their smartphones. T S KARTHIKChennaiIndia