Add intensity to plank and really get those side abs (obliques) by using a riser for height. Then bring your right knee UP to your left elbow, and alternate left knee up to your right elbow. You’ll feel your entire core (arms, too).
![Add Intensity to Plank/Core work using a step riser](https://rgvpersonalfitnesstrainer.com/wp-content/uploads/PlankonStep-500x333.jpg)
Add Intensity to Plank/Core work using a step riser