How much physical activity should an adult have each week?
a. 60 minutes per day, 7 days a week
b. 30 minutes per day, 7 days a week
c. 60 minutes per day, 5 days a week
d. 30 minutes per day, 5 days a week

The answer is letter D. 

Healthy adults should AT LEAST get 30 minutes of exercise per day, 5 days a week. Exercises could involve light activities that would activate the heart to pump extra, improving the blood circulation in the body. These exercises could be brisk walking, light jogging, stretches, or any meditative exercises that would stimulate movement and little exertion. However, adults should always consult a physician first before entering into a training regimen to ensure safety and prevent any untoward incidents.