leg raises vs sit ups?

Why Leg Raises are Better Than Sit Ups

For the activation of the upper and lower rectus abdominis and the external oblique, the sit-up was found to be more effective than the straight leg-raise. However, for the activation of the iliopsoas and rectus femoris, the straight leg-raise was found to be more effective than the sit-up.

Stop Doing Crunches And Sit-Ups — Do Planks And Leg Raises Instead

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