Looking to up your planking game? Try these #PlankVariations by #GainfulFitPro @holtfiit ⚡️ These variations will not only challenge your entire core, but will also help you engage your stabalizing muscles. The primary function of your core is to stabilize your spine and resist flexion (rounding), extension (arching), lateral flexion (side bending), and rotating (twisting). These exercises will teach your spine to do exactly that.