The video below is a live webinar run by PTDC coach Karsten Jensen
In this presentation, Karsten gives a full description of his flexible periodization system. After spending decades in Norway training Olympic and World Class athletes as the Danish strength and conditioning coach, Karsten has taken high performance periodization principles and made them accessible to the general public.
In the video below and accompanying links, Jonathan demonstrates creative new exercises that give you the best of both worlds (stability and mobility) to ensure that yours and your clients abs look great and function.
Karsten also asked that I share this link with you: http://www.flexibleperiodization.com/