Candace Cameron Bure is a force to be reckoned with on "Dancing with the Stars" and now we know why.
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The gym rat and former "Full House" actress spoke to US Weekly after Monday's show and revealed her work out regimen.
"I work out four to five days a week," said the mother of three -- Natasha, 15, Lev, 14, and Maksim, 12. "I lift heavy weights, that's what I enjoy doing to keep building muscle."
She continued, "My cardio is minimal, which made it a little harder for the jive. That was a challenge for me because, as great shape as I'm in, I'm not in great cardio shape."
The 37-year-old actress could have fooled us. Cameron Bure scored a 32 this past week, getting all eights.
She added that she likes to run races and that will run a marathon with Andrea Barber, her friend and co-star, who played Kimmy Gibler on the show.
"She runs marathons! I run shorter races, like 5K or 10K races, but with obstacles in them like Tough Mudder or a Spartan Race because I like the strength stuff and she likes long distances," she said. "Now that she's run a couple races with me, she's dragging me into doing a marathon."