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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The best online workout classes to keep fit at home

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Online Cardiac Rehabilitation Clinic - Pulse Cardiac Health

A new workout for getting lean, mean and pretty

Pulse Fitness Studio

What is squat pulse? Is it more effective than normal squats? - Quora

The Pulse Workout