If you watched the ab+strap video, this is using that technique with more movement. This exercise facilitates the abdominal core through the strap pressure, then we free up the hips to move similarly to walking! This is a fantastic exercise for those who need lower level strengthening or endurance improvement without hip flexor gripping. 

This is a fabulous technique for getting your abdominals to engage. Using your arms to access your upper abdominals often facilitates the WHOLE core. This is a great method for training when you have trouble isolating your abdominals.