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In our continued study of resistance training theory and top personal trainer tips we move on from yesterday and have a look at intensity. Intensity refers to to the amount of effort that is applied to an exercise as opposed to the amount of fatigue or how hard the exercise feels; this is known as relative intensity. In the case of resistance training, 1 RM would equate to maximum intensity. Intensity of an exercise can then be estimated as a percentage of the 1 RM. Unlike cardio-vascular training intensity in resistance does not relate to a corresponding increase in heart rate. That’s not to say that resistance training will not help make a healthy heart and lungs, as certain types of resistance will lead to PHA (Peripheral Heart Action).