Principle: The F>I>T>T> principle is a basic philosophy of what is necessary to gain a training effect from an exercise program.
If you are at a high fitness level, you should train at 70-80% of your max.
Oxygen is required to replace this fuel and therefore you are in oxygen debt until the exercise is finished and the energy storage is replenished through the process of respiration.
Therefore any combination of lower weights, less sets, and repetitions and more time will decrease your intensity and by increasing the weight, sets, and repetitions and less workout time will increase intensity.
They usually involve more than 1 muscle group when e...
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