Which manual would you refer to for guidance on physical training standards?

The reference for guidance on physical training standards is FM 21-20, which is the Army Field Manual specifically focused on physical fitness training. This manual outlines the requirements and standards for physical training within the Army, including exercise recommendations, test standards, and the overall importance of physical readiness. It was designed to ensure soldiers maintain physical fitness, enabling them to meet the demands of military service.

The other options, while related to different aspects of training and readiness, do not specifically focus on physical training standards. For example, FM 3-21.5 deals more with the individual soldier’s training in basic aspects of drill and ceremonies. TC 3-22.20 focuses on the Army's physical readiness training program, providing more detailed instructional material rather than overarching standards. AR 608-1 covers Army Community Service and welfare of soldiers and their families, which does not pertain directly to physical training standards. Thus, FM 21-20 is the comprehensive, authoritative source on physical training standards within the Army context.