People from the Naval staff perform yoga during a mass yoga event to mark the 3rd International Yoga Day on the deck of former warship INS Viraat at the Naval dockyard in Mumbai on Wednesday, June 21, 2017. Pic/PTI

Celebrities and commoners in Mumbai on Wednesday observed the third International Yoga Day, which coincides with the Summer Solstice -- the longest day in the Northern Hemisphere -- on land, water and under water.