Sufficient, Not Maximal

Adults who are not training for competitive sport rarely need maximal development of any single physical capacity. They instead face a resource-allocation problem: how should limited training time and recovery capacity be distributed across strength, muscle mass, cardiorespiratory fitness, muscular power, mobility, balance, and other task-relevant capacities to support physical function over time? This research-informed perspective proposes a practical framework built around sufficiency, functional reserve, dose-response relationships, maintenance doses, and trade-offs between competing training priorities. Physical capacities are treated as contributors to function rather than ends in themselves, and functional reserve is defined here as the margin between an individual’s available capacity and the demands of a personally relevant task. Current evidence supports the feasibility of developing multiple capacities concurrently and suggests that concurrent or multicomponent training can produce a broader adaptation profile than single-mode training. However, the evidence is less definitive that such training universally produces superior overall physical function when total training time is held constant. The framework therefore emphasises four decisions—develop, maintain, count existing activity, or deprioritise—while also incorporating feasibility, adherence, recovery, and the contribution of recreational and everyday activity. The article is a conceptual and practical synthesis rather than a systematic review or a validated prescription model.