Question

what does \intensity\ stand for in the f.i.t.t. principle? how hard you work your body. how deeply you sleep. how much you want to lose weight.

Explanation:

In the F.I.T.T. (Frequency, Intensity, Time, Type) Principle, Intensity refers to the level of effort or how hard you work your body during exercise. The option "How deeply you sleep" is related to sleep, not exercise intensity. The option "How much you want to lose weight" is about motivation or goal - setting for weight loss, not exercise intensity.

Answer:

A. How hard you work your body.