I found this great article on 22 different ways to do a plank.  Check out the pictures or click and watch the videos for ideas for keeping the core strong!  Core strength is a must for better balance, hip stabilization, and better posture – to name a few.

Shore up your core

The plank is one of the best exercises you can do for your core because it builds isometric strength to help sculpt your waistline and improve your posture. And depending on the type of plank you try, you can also engage your back, arms, shoulders, glutes, and hamstrings. Win!

Whether you can hold a plank for 20 seconds or two minutes, you’ll love these fresh variations on the standard move. Bonus: 16 of them don’t require a single piece of equipment.

Forearm plank

This is what most people consider to be a standard plank. Lie facedown with legs extended and elbows bent and directly under shoulders; clasp your hands. Feet should be hip-width apart, and elbows should be shoulder-width apart.

Contract your abs, then tuck your toes to lift your body (forearms remain on the ground); you should be in a straight line from head to heels. Hold for 60 seconds or as long as you can.

Plank with arm/leg lift

This move from Health contributing fitness editor Tracy Anderson targets your upper back, chest, sides, core, and glutes.

Plank jacks

Adding this type of jumping jack to the standard plank engages your abs even more.