To get the best results in your fitness, research has found that shorter but more intensive exercise is more effective than longer drawn-out exercise.
This Morning Routine will Save You 20+ Hours Per Week
Benjamin P. Hardy

This is so true, I’ve just recently took a swing back to the 70’s bodybuilding. 
To narrow it down, they got the most from each set, by slow reps, controlled movement, emphasis on different angles. This applies to almost everything

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