Are you satisfied?" That's what Usha Soman's smile seems to say at the end of a video that her son, actor-model Milind, had put up on his Instagram account on her 81st birthday last weekend. In it, the octogenarian completes 15 push-ups with the poise of a ballerina standing on her toes. Her arms don't shake. Her back doesn't bend. Her pace remains steady. And the smile she gives at the end shows that she is as satisfied with herself as social media was with her, where the video went viral.

It can't be easy achieving this physical feat at that age. And such form can't be achieved overnight, says Shalini Bhargava, director at JG's Fitness Centre in Santacruz West. "She runs marathons, and I'm sure that she's been exercising regularly for a long time," Bhargava says, referring to Soman, adding that other senior citizens can take encouragement from her. For those who do, she has certain tips, considering we are all locked in and the rains are also here. So, when the elderly exercise indoors, they should keep the following guidelines in mind.