You’ll be sure to work your entire low body, core, and arms and shoulders, with the added benefit of focusing on your side body. And while a side plank can be a bit tougher than your standard plank, there are simple modifications to make it a bit easier (or harder, if that’s your thing). Here’s how to do them. Additionally, you’ll want to keep your tailbone slightly tucked forward, which will keep your glutes active and ensure better form. Keep everything active as you hold the side plank. If you want to kick your side planks up a notch, incorporating weights is a simple way to add more of a challenge and emphasize your arm strength.