Brittany Cartwright is putting her best foot forward on season 4 of Special Forces: World's Toughest Test. "It was the hardest thing I have ever done in my life," Brittany, 36, said on the Tuesday, August 12, episode of PodcastOne's "Detox Retox With Tom Schwartz" podcast. "I've been very open about heights and how that terrifies me so doing different things like that, I'm proud of myself." When Tom Schwartz noted that the reality TV show pushes celebrities to their "limits," Brittany agreed before going on to admit that she cried "at least three times" while filming.