@theiconicjoyce__: How to actually grow your abs fast with knee ab crunch. To properly target your abs while crunching, isolate the movement strictly to spinal flexion (curling your ribs toward your pelvis ) so simply Create a C-shape: Round your shoulders and curl your mid-back forward. #absexercice #howtogetabs #kneeabcrunchform #quickabsworkout #coretraining