Answer:
55
Explanation: older adults will be divided into three categories:
Category 1: 55-to 65-years-of-age. May participate in most moderate weight training routines, with only slight modifications (for joint problems, decreased ROM, and any cardiovascular abnormalities).
Category 2: 65-to 80-years-of-age. Modify programs based on medical recommendations, ROM limitations, signs of fatigue, muscle weakness, and joint pain.
Category 3: 80-years-of-age and above. Closely monitor, set low-exertion levels, and emphasize individual muscle group strength, overall posture, strength enhancement, and avoiding injury.