Alternating plank is a core exercise that can work your entire body. It is a great way to build core strength, stability, and improve your balance.
The alternating plank exercise can be done on the ground or in a push up position on an elevated surface such as a bench or chair. To do the exercise, start in plank position with your hands directly under your shoulders and your elbows straight. Your feet should be hip-width apart and knees should be bent at 90 degrees. Brace your abs and lift one arm off the ground while keeping the other arm on the ground. Hold for 3-5 seconds before switching to the other side by lifting the other arm off of the ground while keeping one arm on the ground. Repeat for 10-20 reps per side.