What Does 'Pulsing' In A Workout Class Mean?

Because if it doesn't, pulsing is dead to me. 

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The Importance of Heart Rate When Exercising

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Pulse Fitness Studio

Pulsing is power - Gulf Coast Woman Magazine

Pulse Fitness Studio

Classes

Circuit Pulse + Tabata: Upper Body (50 Min Class) - Weights

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Pulse Fitness Studio

What Does 'Pulsing' In A Workout Class Mean?

What Does 'Pulsing' In A Workout Class Mean?

Pulsing is power - Gulf Coast Woman Magazine