April 11, 2016 4:04 PM EDT

Kate Middleton’s secret to staying slim after giving birth twice is constantly chasing after her young children, she told a party guest in India.

The Duchess of Cambridge, who is visiting India with her husband Prince William during the couple’s first royal tour in two years, was “gracious” as she fielded questions from a garden party attendee in Delhi on Monday, PEOPLE reports.

“We said, ‘How do you lose all the weight after having two kids?’ ” Bulbul Dhar-James, a professor, told the magazine. “And she said, ‘I am running after my kids!’”

“I asked her, ‘Aren’t you tired of smiling?’ And she said, ‘I’m just reciprocating. Everyone is so warm,’ ” the party guest recalled. “She was so gracious.”

Read more at PEOPLE.

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