WHY THIS HAPPENS
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Excessive reach — stem too long or bars too low for your flexibility
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Weak core — lumbar spine absorbs force the core should stabilise
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Tight hip flexors from desk work — pelvis forced into anterior tilt
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Saddle too high — overextension causes rocking, fatiguing the lower back
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Lack of position variety — same posture for hours
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Insufficient hamstring flexibility — tight hamstrings load the lumbar spine