When are we allowed to change tenses?

Question

My FITT plan mainly focuses on the Cardiovasular and Respiratory systems. (cardiorespiratory endurance) Cardiorespiratory endurance is the ability of my heart and lungs to deliver oxygenated blood to my muscles and other parts. The activity that will be done in this FITT schedule is jogging.

 

^Are all the tenses correct?

Answer 1

The main focus of my cardiovascular and respiratory system is my FITT plan.  Cardiovascular endurance is defined as the ability of my heart and my lungs to circulate oxygenated blood to my muscles, organs, tissues and  cells.  The FITT plan involves the physical activity of jogging to make the relevant observations.