Roland, just hazarding a guess here but it may be that you have a post. chain strength imbalance so that your left glute/ham is having to work harder.
If you know the left is weaker than a bit of extra volume on the left during unilateral movements might do it.
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Working "hard," or the perception of working hard, doesn't really mean anything. Sweating, vomiting, and breathing hard could be a good workout or a tropical disease kicking in.-Dan John
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