The curl-up is part of spine expert Stuart McGill’s 'Big Three', shown in research to increase core endurance without stressing the lumbar discs. 'The McGill Curl-Up teaches the core to brace without ...

A powerful, time-efficient workout designed to strengthen your core, improve posture, and carve defined abs at any fitness ...

Case in point: You rely on your core muscles to carry you through the miles. And research shows that core strength training can improve the force you put into your steps, your overall energy transfer, ...