My favorite exercise to target the core
Planking is a simple but effective bodyweight exercise.
Holding the body (light as a feather) stiff as a board develops strength primarily in the core—the muscles that connect the upper and lower body—as well as the shoulders, arms, and glutes.
1. Plant the hands directly under the shoulders (slightly wider than
shoulder-width apart) like you’re about to do a push-up
2. Ground the toes into the floor and squeeze the glutes to stabilize the
body. Your legs should be working in the move too; careful not to lock
or hyperextend your knees.
3. Neutralize the neck and spine by looking at a spot on the floor about a
foot beyond the hands. Your head should be in line with your back.
4. Hold the position for 20 seconds. As you get more comfortable with the
move, hold your plank for as long as possible without compromising
form or breath.