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How come when I L-sit my back is always bent forward? It doesn't feel necessarily painful but it does not feel right, and I heard that you should try to aim for a near strict back posture. My posture is almost completely leaning forward, any advice for fix? Is it just a mobility issue?

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A few explanations may be:

  1. Your arms are too short
    • If your arms are not long enough to keep your body off the ground then your body is compensating
  2. Your center of mass when you have a straight back is behind your arms
    • Your pelvis may be behind your arms and your upper body is drawn forward to balance it out
  3. Your back is not strong enough
    • Your back isn't able to counteract the force of your abdomen contracting
  4. Your lateral & posterior deltoids and lats may not be strong enough to support your shoulders holding you upright.
    • By rotating forward, your body is compensating with stronger anterior delts

If you haven't already, I would suggest video-taping yourself performing the L-sit from the side, and seeing if you can spot what fails first when performing the exercise.

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    The option you miss is that it could also be a mobility issue in the hamstrings / glutes, which causes a rounding in the back to create the L shape.
    – MJB
    Commented Oct 18, 2022 at 9:17
  • @MJB good one, i neglected stretching
    – jros
    Commented Oct 24, 2022 at 12:04

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