Strengthen your core with these five standing ab exercises that target deep, hidden muscles for better balance, posture, and definition—no floor work needed.

After that, bend your left elbow and your right knee, crunching your abs, until they touch underneath your stomach. Repeat using your right arm and left leg. Alternate between sides, performing 10 ...

Bend the left knee and straighten the right leg at a 45-degree angle, while also crunching your right elbow toward your left knee. Return to start, then bend the right knee in toward your chest ...

And side plank crunches, where you bring the knee of the top leg and the elbow of the top arm to meet in the middle of your core: “I love this one and do it a lot in the Strong Women Instagram ...