Answer:
<h2>Alternate days of the week that you perform that activity.</h2>
Explanation:
The principle of frequency refers to how many times per week you do aerobic and anaerobic exercises. Alternating between these two types of exercising will help you improve your physical condition because your are training both types of exercises that involves oxygen (aerobic) and without it (anaerobic).
However, planning based on the principle of frequency depend on many variables like your current weight, your physical aptitude, if it's the first time you do those exercises, if you know your limits like possible affections in important parts as knees or ankles. All these will help you to plan how can you alternate exercises, the frequency and intensity.
