The Over 40 Ab Solution book download in PDF format, by Shaun Hadsall. More power to you! Remain strong mentally, physically always! Planking for a few minutes each day helps strengthen your core, arms, legs, tones your buttocks, builds abs, and improves your mental focus. It helps improve balance, posture, and endurance. Maintaining core strength is an important part of mobility and balance, which can prevent fall-related injury.