Three Principles of Training 

The ones you feel contract and become tense during the movement/exercise

example: If you want to increase leg strength you must do leg exercises such as squats, lunges, calf raises, leg press, etc.

Your body adapts to lifting the same amount of weight therefore you need to gradually increase the level of exercise in order to sustain improvement in physical fitness.

Muscles adapt to increased workloads by becoming larger and stronger and by developing greater endurance.

used to accomplish the principle of overload.

It outlines how to manipulate your program to get better results, change your workouts to avoid boredom, and reduce overuse injuries and plateaus.

- How often you exercise.

- Increasing the number of times, you train per week.

- How long you exercise

- Increasing the length of time that you are training for each session.

- How hard you work during exercise

- Increasing the difficulty of the exercise you do.

- The kind of activity you are doing.

- Increase the difficulty of the training you are doing.

F. I. T. T.

Any activity that gets your heart rate up

Examples: Swimming, running, cycling, sports, etc.

Any exercise that increases the range of motion at the joint

Examples: Stretch, yoga, resistance bands, Pilates, gymnastics, etc

Any exercise when you are using some type of resistance

Examples: Bands, dumbbells, stability ball, body weight, etc.

For example, starting stretched past the relaxed position and ending in a fully contracted position.

When an exercise has progressed through a complete range of motion and back to the beginning.

One repetition performed against the maximum possible resistance.

A series of repetition without a rest. 

For example, 10 bicep curls in a row and then you rest for a minute

The inability of a person to do another correct repetition in a set.

is used once you set fitness goals for yourself in order to provide you with workout guidelines for achieving your fitness goal.