Hip abduction training with the feet planted is effective for preventing knee and lower-back injuries. OKC alone, such as clamshells, is not enough for injury prevention. By the way, at the judo club I coach we thoroughly cover assessment, weight training, recovery, and movement.

A video posted by @fk412 on X (formerly Twitter) (July 16, 2021 ・ その他 ・ 0:14). Watch and download it on XCLYP.