Is the regular plank exercise too easy for you? Try this variation of the plank; also called the 'plank with alternating arm and leg lifts' Facebook - https://www.facebook.com/VentunoFitness Twitter - https://twitter.com/VentunoFitness Youtube - http://www.youtube.com/user/ventunofitness A Ventuno Production http://www.ventunotech.com