How often should I exercise?
This really depends on an individual's current fitness level, the time he or she has available each week as well as the goals they have and what they want to achieve by exercising.
For those who haven’t been exercising for a while they should aim for two or three times a week for at least 20 minutes, preferably more. Once your fitness level improves, you can then increase the frequency of exercise sessions or their duration, which will help you to improve further.
For general conditioning and weight management, the ACSM guidelines recommend 20-60 minutes in duration for aerobic exercise.
If you're aim is to stay healthy, the American College of Sports Medicine recommends moderate intensity cardio of 30 minutes a day five days a week, or 20 minutes of vigorous, intense cardio, three days a week.
Add on top of that two-three nonconsecutive strength-training days a week. It is important to build up gradually and to have a rest day once a week. For those who are new to exercising or getting back into it after a long break, make sure to have a rest day after each workout.