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It looks like the X3bar (really bands) suffer from the classic problem of mismatch to your strength curve, with the strongest resistance where your lifting is weakest. Nautilus equipment generally solved that problem by the 1980s.

Free PDF of Nautilus Training Principles: Bulletins No. 1-3 http://baye.com/store/nautilus-bulletins/

Summary of research and evidence-based exercise as of 2009: Body by Science https://www.amazon.com/Body-Science-Research-Strength-Traini...

Author Doug McGuff MD has been operating a training facility since 1998, 100-120 client sessions a week, and he reports zero injuries to date. Most injuries come from excess force/acceleration, so pick an exercise protocol with very low acceleration that seriously fatigues the target muscle.

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