Use it or Lose it- How to Treat Deconditioning: Guidelines for physical activity for community dwelling older adults

Recommendations put forth by the Journal of American Family Physician, 2010.

Minimum activity for achieving important health benefits includes:

Two hours and 30 minutes (150) minutes of moderate-intensity aerobic activity (e.g., brisk walking) per week, plus muscle-strengthening activities on at least two days of the week; or
One hour and 15 minutes (75 minutes) of vigorous-intensity aerobic activity (e.g., jogging, running) per week, plus muscle-strengthening activities on at least two days of the week; or
A combination of moderate and vigorous-intensity aerobic activity equivalent to the recommendations above, plus muscle strengthening activities on at least two days of the week.