Which of the following is NOT a phase of Army Physical Readiness Training (APRT)?

The execution phase is not recognized as a phase of Army Physical Readiness Training (APRT). In the context of APRT, the primary phases include toughening, sustaining, and initial conditioning.

The toughening phase focuses on building foundational physical readiness, emphasizing basic fitness and preparing soldiers for more rigorous training. The sustaining phase is aimed at maintaining and enhancing the fitness levels previously developed, ensuring soldiers remain at optimal physical capability. Initial conditioning serves as the introductory phase where soldiers begin their physical training regime.

By identifying the execution phase as an option, it is essential to note that while execution may be a part of broader training practices, it does not specifically define any of the structured phases within the APRT framework. Thus, the correct response points to B as it does not align with the established phases recognized in Army Physical Readiness Training.