Side plank engages your entire body & even includes some balancing. Looking to build heat in your practice, try moving (with your breath) between plank and side plank! Here are some things to keep in mind for this pose:
Keep your hips in line with the rest of your body (no sagging!). If you find your hips sinking toward your mat, lower your bottom knee straight down for additional support.
Keep your shoulders in line with one another, reaching your lifted hand toward the ceiling.
Slowly turn your gaze toward your lifted hand (this is where balance really kicks in). If you loose balance, turn your gaze down toward your lowered hand.
If your balance is off, you can also line your feet up rather than stacking them. Once you’ve found your balance, try restacking your feet.