There are so many variations of plank - the ultimate bodyweight move to tone your core and upper body. If you really want to carve your six-pack and lengthen your obliques, try these ab-focused variations, with a bonus video at the end demonstrating 15 side plank variations.
from POPSUGAR https://www.popsugar.com/fitness/Plank-Exercises-Abs-45166212
via IFTTT
