The AHA & ACSM have updated their guidelines for adults first published in 1995.

Physical inactivity remains a pressing public-health concern. All healthy adults aged 18 to 65 need moderate aerobic physical activity for 30 minutes, 5 days a week or vigorous activity 20 minutes 3 days a week.

No time? Combining short bouts of activity-10 minutes or more-can be combined to meet the 30 minute daily goal.

In addition to strength training and aerobic exercise, don't forget stretching to improve flexibility. This will help your balance and make you less likely to fall.