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How Long. For walking, bike riding or other moderate exercise -- rigorous enough so that it's hard but not impossible to talk -- seniors should slowly build up to 30-minute workouts. And if 30 minutes all at once is impossible, two 15-minute sessions or three 10-minute workouts are fine.
Vigorous-intensity exercise may be too much for someone who has been inactive, so obese individuals should start with 150 weekly minutes of moderate-intensity exercise. This will help slow or stop weight gain, but to lose weight, obese people will need to get more exercise. The ACSM recommends that obese individuals gradually work up to 250 minutes of weekly moderate-intensity exercise to increase weight loss. This can take any form: for instance, five 50-minute workouts per week or seven 37-minute workouts a week. Resistance Training Obese individuals should follow the same guidelines as other healthy individuals for resistance training, working out all major muscle groups twice weekly.