The physical activity guidelines for americans provide guidelines specifically for older adults. "which of the following is not one of these guidelines"a. for those over age 65 who are at risk for falling, exercises that improve balance are recommended. b. all adults should engage in moderate-intensity aerobic physical activity for at least 150 minutes per week, vigorous-intensity aerobic activity for 75 minutes per week, or an equivalent combination of the two. c. to maintain lean tissue and basal metabolic rate, strength training should be performed 5 to 7 times per week. d. stretching each major muscle group should accompany aerobic or strength training at least 2 days per week.

b. All adults should engage in moderate-intensity aerobic physical activity for at least 150 minutes per week, vigorous-intensity aerobic activity for 75 minutes per week, or an equivalent combination of the two.

Explanation:

The Physical Activity Guidelines for Americans guidelines for older adults states that:

Older adults are more susceptible to cardiac and nervous disorders along with poor musculoskeletal strength.  

To maintain good cardiac and nervous health; musculoskeletal fitness and strength; reduce depression, cognitive decline; older adults are directed to engage in moderate-intensity/vigorous or combination of both aerobic physical activities and muscle-strengthening exercises.

They should include physical activities combining one or more of; occupational (work-based) activities; transportation (walking, cycling); household chores (cleaning); leisure time activities (gardening, dancing); sports activities (hiking, biking, swimming, games, running) and planned daily routine exercise activities; all of them as part of their daily routines performed as an individual, family or community-based activities .

Older adults with mobility issues should perform exercises to improve their balance and prevent falls .