Sit-ups and crunches are phenomenal for strengthening the midsection, but a few performance SNAFUs can lead to low back pain (LBP), hip pain and/or groin pain:
Wrong! Too wide of an arc can stress the hip flexors (psoas) causing low back pain (LBP).
Perfect! ~ 20 degrees is enough to work the abdominals while sparing the hip flexors and thus avoiding LBP.
