Kelly Ripa's Sleepless Nights

One would think that talk-show queen Kelly Ripa would have no trouble catching some much-needed shut-eye when she turns out the lights and tucks her three adorable kids into bed, but that's not always the case. “I used to smoke, so lung cancer is the thing that keeps me awake at night,” the 37-year-old beauty confesses in the new issue of Fitness. “I worry, 'Did I quit in enough time? Did I do it for too long?'”

Another topic that gives Kelly a lot to think about is the heart scare that sidelined her Live co-host Regis Philbin for several weeks, and which she says is a reminder to stay on top of her health. Kelly also supports HEART for Women Act. The advocate explains, “As women, we’re more interested in stuff that affects us immediately rather than thinking long-term.”

One thing that's certain is that Kelly doesn't have to worry about looking bad in a bikini or a pair of jeans. Though she now runs three to five miles a day, one trick she lives by definitely gives her a boost. “I buy jeans that are tight in the rear end,” she explains. “I treat my cheeks like breasts in a push-up bra. I just reach down in there, lift them up and push them together.”

For the full interview, pick up the new Fitness, on stands now.