When designing an exercise program, there are a variety of things that you need to consider. Each program needs to be tailored to the individual completing it and you need to consider the following factors:
Age
Level of health
Previous training experience
Current fitness level
Genetics
Fitness/Exercise Goals
Safety
Available time
Motivation
What activities you want or need to include
How long you plan to train for
Once you have considered the factors above, you are able to work towards designing a training program that will be tailored to individual needs. A way to design an effective program is to apply the following principles: