Increasing your target heart rate while rollerblading from 145 beats per minute to 170 beats per minute is an example of using which training principle of fitness to improve your workout: frequency intensity time type

Increasing your target heart rate while rollerblading from 145 beats per minute to 170 beats per minute is an example of using which training principle of fitness to improve your workout:

B, Intensity

answer; i believe that the correct answer is (a) restriction);