Three principles of training:

1.  Principle of overload : The overload principle is a basic sports fitness training concept. It means that in order to improve, athletes must continually work harder as they their bodies adjust to existing workouts. Overloading also plays a role in skill learning.
2. Principle of Specificity : The principle of specificity states that the more specific a training activity is to a given sport—muscle group, work load, velocity and pattern of movement, body posture, and range of motion—the more it will contribute to increasing performance in that sport. .
3. Principle of Individualization : This could also be called the snowflake principle, since it highlights that no two climbers—or their optimal conditioning program-are the same. The best training program for a person will target his/ her specific weaknesses, address past or present injuries, provide sufficient time for recovery, and be structured to provide the greatest output for the available training input.