Learn how to activate and sculpt your core with this home workout from former Royal Marines commando trainer Jon Stratford. Jon will take you through a core workout. By teaching you how to activate the deep muscles in your core and how to correctly execute key exercises including front and side planks, split crunches and the cobra core you will be able to design your own personal core workout to carry out at home or in the gym. This Grokker Premium video forms part of Jon Stratford's Fitness Toolkit collection, giving you the tools you need for the perfect personalised workout.