Answer: c. three times a week
Step-by-step explanation:
The frequency of workout should be more to ensure results over the body. A person should perform at least 150 minute moderate aerobic activity or may do 75 minutes of the vigorous exercises in a week or a combination of both vigorous and moderate activities to ensure increase in strength of muscles, improvement of endurance and overall flexibility of the body.
The frequency of workout should be managed according to the diet and available strength of the person. Doing work out three times a week will help a person to remain frequent in doing exercise and may also get time to take rest to balance the workout procedure and prevent the overstrain over the body.