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The training phase that emphasizes prime movers and allows older adult clients to handle heavier loads is the strength phase. This phase is designed to increase muscle mass, strength, and endurance by focusing on enhancing the function of the primary muscle groups involved in various movements.

In older adults, this phase is particularly beneficial as it aids in improving overall functional capacity, helping them perform daily activities with greater ease and efficiency. By allowing for heavier loads, it challenges the muscles to adapt and grow stronger, which is crucial for combating age-related muscle loss and maintaining independence.

This phase typically includes exercises that promote multi-joint movements and heavier resistance, allowing for a safe yet effective increase in strength. It is essential for trainers to ensure that older adults are using proper form and technique to minimize the risk of injury while maximizing the benefits of strength training.