Anna Kaiser’s abs-burning move helps Kelly Ripa look super strong in a bikini

Kelly Ripa might be small, but she’s strong—both physically and mentally. When Ripa’s hubby recently posted a photo of her (and her abs of steel) rocking a bikini, she was clearly living her best (healthy) life.

Fitness has long been a high priority for the mom of three who trains with AKT founder Anna Kaiser four to five days a week for 60 to 90 minutes per session. And even though there’s a wide range of exercises they do together during their dance-cardio workouts, there’s one abs exercise in particular that helps Ripa look so strong.

According to Kaiser, ballers—or stability ball knee tucks—in particular work the entire body, but they especially blast the abs. Still, “every exercise we do works your full core—the butt, the abs, and the back—at the same time,” Kaiser told Women’s Health. “If you’re training functionally, you’re hitting those muscles from all planes of motion.”

“Every exercise we do works your full core—the butt, the abs, and the back—at the same time. If you’re training functionally, you’re hitting those muscles from all planes of motion.” —Anna Kaiser

To master this first functional move like…a baller, Kaiser suggests getting in a push-up position and resting your shins on an exercise ball. Next, tuck your knees, rolling the ball in toward your chest, all while making sure your lower back stays straight. Then after a quick pause, untuck your knees, returning the ball to where you began. After repeating the move 30 times, you’ll be feeling a serious burn. Want to take things up a notch? Kaiser also loves adding a push-up to the core-blasting move. No wonder Ripa is so ripped, right?

Here are five things Kelly Ripa can teach you about dealing with negativity. Or, find out some super-interesting facts about her fitness habits.