The amount of rest people need is going to vary dramatically based on fitness, genetics, amount of exercise, etc. I try to run 5 days a week (6 miles per day)

The amount of rest people need is going to vary dramatically based on fitness, genetics, amount of exercise, etc. I try to run 5 days a week (6 miles per day) and then have an active weekend (usually hiking/backpacking.) I find that is a sustainable amount of exercise for my body. I'll occasionally do longer runs or bigger backpacking trips and take a day or two off here and there when I feel I need it.