What it works:
Core strength is key for a runner.
Not for sideliners, the power plank is a formidable challenge that will develop core strength, quads, and overall stability and balance throughout your body.
Start with the hands under the shoulders, knees under hips, and a neutral spine. Keeping the knees off the floor, extend the hip and knee and simultaneously flex the opposite shoulder. Either continue with the same arm and leg or repeat the movements with both limbs in an alternating fashion. Make sure to keep your back straight. Hold a dumbbell to progress the exercise.
The Best Bodyweight Abs Workout>>>