Which combination represents the definition of power in a fitness context?

In a fitness context, power is defined as the rate at which work is performed or the amount of energy transferred over time. The correct choice reflects this concept as it combines force and speed, which are crucial components in determining power output.

When force is applied to move an object, the speed at which that force is applied contributes to the overall power produced. This means that in exercises where explosive movements are required, such as sprinting or jumping, both the magnitude of force exerted and the speed of that exertion play significant roles in generating power.

Other options present different concepts that do not encapsulate the definition of power as effectively. For example, weight lifted over distance pertains more to work rather than power, as work is quantified without considering the time factor involved. Speed plus agility describes components of athletic performance but doesn't incorporate the necessary element of force. Flexibility and endurance refer to different physical qualities unrelated to the concept of power. Therefore, the combination of force times speed captures the essence of what constitutes power in fitness, making it the correct answer.