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The 52-year-old actor will next be seen in the action sequel Race 2.
He told The Times of India: "Lately, I've been into yoga, which I'm enjoying thoroughly. I'm doing Bikram Hot Yoga, which is being in a sauna and doing 27 asanas in the heat, sweating it out for an hour and a half, four days a week.
"We all discovered it together - except for my younger daughter and my son - Sonam, my wife and I practise it. My son is in America, and Rhea is a lazy one, she doesn't exercise. She is slim, yes, she's lucky that way, but she has to now otherwise she'll become fat."
Kapoor added: "It's not a question of judging, it just adds to your personality. You can't ignore it. You don't have to be handsome or good looking or have great features.
"I'm talking about being fit. You might be looking the way you look, you can't change that, that's your genes, that's what God wanted you to be. But at least being fit is in your hands. Health is as important as anything else."
The Mission Impossible - Ghost Protocol star performed his own stunts for his upcoming film Tezz.
However, the actor reportedly asked the director to rework scenes so he would not have to appear topless.
Watch a trailer for Tezz below:
