[header] How to exercise your abs standing up [title] Use twisting exercises to work your obliques. [step] Ab exercises that include a twist or cross component will work your entire core, but are especially helpful at working the obliques that run along the sides of your abs. [substeps] For example, you can try side-to-side waist twists. 
Hold your arms close to your body with your elbows bent. Slowly turn your shoulders to the right while keeping your hips forward.