Final answer:
A client should take more rest between sets when the goal is hypertrophy to allow muscles to recover and prepare for the next set. For muscular endurance, shorter rest periods are used. Compound movements and beginners may also influence the length of rest periods.
Step-by-step explanation:
When considering rest periods between sets in a workout, it's important to align the rest duration with the fitness goal of the individual. If a client's goal is hypertrophy, which refers to the increase in muscle size, they generally need a longer rest period between sets. This allows for muscle recovery and the ability to perform the next set with sufficient energy and strength. On the other hand, if the goal is muscular endurance, shorter rest periods are utilized to adapt the muscle to sustain effort over a longer period. Compound movements, which work multiple muscle groups, may also require longer rest periods due to the greater exertion involved, especially as the athlete becomes more advanced and uses heavier loads. For beginners, rest should be based on their current fitness level and ability to perform exercises safely and effectively.