Fitness: How to do a plank

It is crucial that you keep your back straight, tighten your abs and squeeze your bum 

The humble plank is one of the simplest, yet most effective exercises for strengthening your core. It engages all your core muscles including your six pack and obliques and also works your bum and lower back.

In order to benefit fully from a plank, ensure that you are using correct form every time. Although this is a popular exercise, it is very common to find it being performed incorrectly.