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Intensity, volume, frequency, and rest are matters which are related and may apply to any workout routine. Frequency may be the number of times you train inside a given time period for example, one week. When deciding how often to train, you need to consider several things before setting up your plan: What type of shape are you in now?
What age range are you currently in? What do you want to complete? And lastly, what amount of rest will you need? To allow for recovery its essential to get your rest!
Each one of these things determines how frequently you are able to train.
Between these four aspects youll need a good balance to be able to put together a successful training schedule for a sprint triathlon. You will need to move down the frequency as you move up the intensity in your workouts, as the body will require more rest to be able to properly recover. To practice more often, you can alternate between easier and harder training days, and varying your workouts through the week.
When figuring out your training schedule its also important to consider your profession. Do you have a physically demanding job? Or most days of your work week are you sitting in a desk? Either can benefit or hinder your fitness goals, but you will have to know this before going in to your training.
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From: (sprint training for triathlon) http://triathlonsprinttraining.wordpress.com