Plank

Plank is a simple but effective exercise for strengthening your core muscles. Here are the steps to perform a plank:

1. Lie on your stomach with your elbows under your shoulders and your forearms on the floor.
2. Lift your hips and legs off the floor and align your body in a straight line from head to heels.
3. Keep your core tight and your back flat. Don't let your hips sag or your head drop.
4. Hold this position for as long as you can, breathing normally.
5. Repeat as many times as you want or until you feel fatigued.