The rail-thin Seagram’s heiress accused of bankrolling upstate sex cult Nxivm has been granted an additional 30 minutes each week out and about to exercise and buy groceries.

Clare Bronfman had previously been allowed to leave home three times weekly for 90-minute periods, spending the rest of her time out on $100 million bail holed up in her one-bedroom unit.

But the 39-year-old’s lawyers earlier this week requested that their running-obsessed client get just a little more time outdoors.

Brooklyn federal Judge Nicholas Garaufis granted the request late Tuesday.

Bronfman has been accused of money laundering, extortion and other crimes for her high-ranking role in the group, which prosecutors say masqueraded as a self-help and empowerment organization.

Instead, the government claims the group’s leader, Keith Raniere, kept a stable of sex slaves whom he and his reputed slave master, “Smallville” actress Allison Mack, starved and branded with their own initials.

Mack is out on $5 million bail, and Raniere remains behind bars.