Question

Alberto wants to improve his cardiorespiratory fitness levels, so he increases his eight-minute, one-mile run to a 1.10-mile run in the same amount of time. This principle is known as

intensity
type
time
frequency

Answer 1

The answer is intensity. Yup.

Answer 2

The answer would be A) Intensity. Because, You are pushing your body to get in all the training it needs in a short amount of time by intensifying the workout.