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The statement "Power is the key element that will enhance improvement of muscular strength and endurance" can be evaluated as follows:

- **Strength** refers to the maximum amount of force that a muscle can produce.
- **Endurance** is the ability to sustain prolonged exercise or activity.

While power (the rate of doing work or the ability to exert force quickly) can contribute to improvements in strength and endurance to some extent, it is not the sole element. Other factors, such as the type of training (resistance training for strength, aerobic exercises for endurance), nutrition, and recovery, also play significant roles.

Therefore, the answer could be interpreted as **False**, since power alone is not the key element for both muscular strength and endurance improvement.

Answer: **False**