1 The length of time that a training session lasts. The optimum duration of training will depend on the intensity of the session and the level of fitness of the individual, but a minimum period of 15 min is recommended for the improvement of health.
2 The length of time for a particular training programme. The minimum period required for improvements to occur varies considerably, but tends to be longer for aerobic activities (at least 12 weeks) than anaerobic activities (at least 8 weeks).
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