Final answer:
To meet or exceed physical activity guidelines, Mark can increase weightlifting to four days a week and add one hour of vigorous-intensity exercise while maintaining his current routine.
Explanation:
To meet or exceed the physical activity guidelines, Mark can make the following changes to his exercise routine:
- Maintain his current aerobic exercise routine, but increase his weightlifting to four days a week.
- Add one hour of vigorous-intensity exercise while maintaining his current exercise routine.
By incorporating these changes, Mark can ensure he meets or exceeds the recommended physical activity levels.
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