Question

Changing the duration you hold a stretch or perform a cardio activity is an example of adjusting which training principle?
Frequency
Intensity
Time
Type

Answer 1

Time.

If you hold a stretch or perform a cardio activity longer, you are adjusting the time of the activity.

Answer 2

I think the answer is frequency because frequency is the number of occurrences of a repeating event per unit of time so your muscles would do a repeating exercise

Hope this helped!