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Especially with the decreased daylight and extreme cold in Northern Hemisphere regions during the off-season, it can be very difficult putting in the long bike time required for traditional aerobic base training. The prospect of prolonged steady efforts on the trainer is also anathema to many. Therefore, the judicious use of high-intensity workouts during the offseason will most likely NOT damage or ruin your fitness. Indeed, it may help to not only maintain but to increase your aerobic capacity in the process.