Kevin Federline can't take the heat.
The 33-year-old recently collapsed while filming Excess Baggage, the Australian version of Celebrity Fit Club, E! News reports. According to a show rep, the incident happened in the Kimberley region in Outback Western Australia, which is "widely regarded as one of the most remote and hostile parts of the country."
Under a medic's advice, Federline was "taken to a hospital as he was showing signs of heat stress."
Britney Spears' ex-husband -- who has two sons with the 30-year-old pop star -- resumed shooting in the same location shortly after. Excess Baggage will premiere on the Nine Network in 2012.
Federline first appeared on VH1's Celebrity Fit Club: Boot Camp in 2010 in an effort to shed the 85 pounds he gained following his 2006 divorce from Spears. Though he lost 30 pounds on the show, Federline later gained it back.