Keto Fit Pro None of the plate-loaded leg extension machines I've tried so far were really good. Therefore, I think a leg extension machine is better than a stack-loaded cable machine. The best leg extension machines have a seat that slows back slightly. I never use leg extension machines that will not allow me to lower weight 100% (up to full quadriceps stretching) without losing tension in the muscle at the lower part of the rep.

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