To design an efficient exercise program you have to manage different variables, so, it is of utmost importance know them. See the video and infographic below for your guidance.
Training Variables to designing a program:
What variables are important to consider while design an exercise program?
Need to consider both the positive and negative impact that different forms of types or training may have upon the different systems.
Eg. Maximal strength training has a strong positive impact upon the musculo-skeletal and nervous system but only minimal positive effect upon the cardio vascular system.