If your personal trainer insists that you do all of your lower-body exercises on a BOSU or other unstable surface, unless you’re a log roller or tightrope walker, it’s probably time to find a new trainer:

Unstable surface training (UST) using inflatable rubber discs attenuates performance improvements in healthy, trained athletes. Such implements have proved valuable in rehabilitation, but caution should be exercised when applying UST to athletic performance and general exercise scenarios.

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