What is the 12-3-30 workout?

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[{"selector":"#anim-b12a4718-fd19-4223-be95-2df796ee20d3","keyframes":{"opacity":[0,1]},"delay":0,"duration":600,"easing":"cubic-bezier(0.4, 0.4, 0.0, 1)","fill":"both"}] The name may sound confusing, but the 12-3-30 Workout is straightforward

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