Final answer:
The three fundamental training principles in PRT program development are Specificity, Overload, and Reversibility. They are crucial for ensuring relevant, challenging, and consistent training to achieve physical fitness goals.
Step-by-step explanation:
The three training principles fundamental in the construction of Physical Readiness Training (PRT) program development, as indicated within the seven principles of training from ADP 7-0, are Specificity, Overload, and Reversibility. These principles help ensure that training is targeted to the right areas (Specificity), that it challenges the body enough to make gains (Overload), and acknowledges that gains can be lost if training is not maintained (Reversibility).
Specificity relates to ensuring the training is relevant to the desired outcomes and focuses on particular aspects of physical fitness. Overload refers to the need to increase the intensity, duration, or frequency of exercise to achieve advancements in fitness. Reversibility reminds us that any improvements can be reversed without ongoing exercise, highlighting the importance of regular participation in PRT programs.