You want to strengthen your abs – so what should you do? Bicycle crunches? V-ups? Or how about the well-known move that is the plank? If you’ve already been incorporating planks into your strength ...

Pilates pro Simone de la Rue demonstrates how to do a plank jack—aka the ultimate cardio and core-strengthening move—with proper form. A little known fact about planks: In addition to working nearly ...

How to do the perfect side plank, and how to make it easier (and harder). Planks are hard. Even just 30 seconds in plank position can feel like an eternity. But as challenging as planks are, side ...

‘The plank jack is a similar exercise to the press up and front plank, in that it requires loading and control of the core in a lengthened position and involves using the arms and shoulders to ...