'These exercises will challenge your ability to hold good posture and pelvic alignment against both body weight and the instability of the Fitball. More information on the exercises here - http://bit.ly/GDMCId The positions of the holds are similar to the static floor exercises, except that they are performed on the ball. Research shows that performing core exercises on an unstable surface, such as a Fitball will increase the levels of trunk muscle activation.  Subscribe to the Peak Performance YouTube channel: http://www.youtube.com/user/PeakPerformanceVids?feature=mhee  Free training plans and workouts: http://www.pponline.co.uk/  Follow Peak Performance on Facebook:  https://www.facebook.com/pages/Peak-Performance/6140642631?sk=wall  Peak Performance on Twitter: https://twitter.com/#!/sports_perform' 

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