The Swiss ball plank is a highly advanced plank variation that strengthens the core, lower back, and entire upper body. The ball works as an unstable surface that increases the difficulty of the move.
What if I were to tell you the stability ball isn't the best way to hit the core musculature on an unstable surface to increase the difficulty of the move.
Here we have the same basic movement that provides instability, strength and overall effectiveness but YOU won't do it or have your clients do it because you don't see the purpose.
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