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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.
If you're concerned about cardio exercise wasting away your muscle tissue, two to three moderate intensity cardiovascular sessions per week of 30 minutes should be enough. Keep in mind that it's possible to sustain your heart rate at an aerobic capacity for 30 minutes or more during weight lifting.or general guidelines, the American College of Sports Medicine recommends 30 minutes or more of moderate-intensity exercise three to five times per week.