Question

Explain why exercise programs must increase in difficulty and duration over time to remain effective.​

Answer 1

Answer: Exercise programs must increase in difficulty and duration to remain effective because of the principle of overload.

Explanation: just took test,

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Answer 2

Exercise programs must increase in difficulty and duration to remain effective because of the principle of overload. As an individual exercises at a higher level, the body adapts to the increased demand and this higher level eventually becomes your body's new normal.

Step-by-step explanation: