As people get fitter do I make the workouts harder?

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As people get fitter do I make the workouts harder? | How important are goal times & intensity levels? | Working out in heat & humidity. | A replacement for GHD sit-ups. | Training vs Testing. | Smoothies. | Doing your own workouts from time to time.

As people get fitter do I make the workouts harder?

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As people get fitter do I make the workouts harder?
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