The pace of your long run depends on your level of fitness.

长距离的配速取决于您的身体素质。

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As your level of fitness improves your LT will also improve (go up).

随着身体素质的提高，您的乳酸门槛也会提高。

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A personal trainer can also recommend devices that are appropriate for your level of fitness.

同时教练也会更具你的身体强健程度为你制定适量的器械训练计划。

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You rise through various levels, from blue to gold, as you accumulate points (rewards are adjusted to your starting level of fitness to give everybody a chance of making progress).

ECONOMIST: Schumpeter

To find a route matching your fitness level and time frame, pick the brains of local tourist office staff, who can also supply you with maps and tips.

BBC: Getting fresh in Germany: Cycling, hiking and skiing