Hell, even sit-ups are largely useless. https://www.theatlantic.com/health/archive/2022/05/sit-ups-crunches-lower-back-pain/639437/ https://www.theatlantic.com/

Hell, even sit-ups are largely useless. https://www.theatlantic.com/health/archive/2022/05/sit-ups-crunches-lower-back-pain/639437/ https://www.theatlantic.com/health/archive/2022/05/sit-ups-c...