It really depends on what you want to achieve. An excellent starting point is to get 30 minutes of activity daily. That doesn't necessarily mean that you need to go to the gym, though. You can go for a brisk walk, play with your kid(s) or pet(s), or play a sport you enjoy. Basically, anything that elevates your heart rate from physical activity is very beneficial. Once you make it to the gym, it all depends on what you enjoy and consistently do. For some people, the best amount is 3 days a week. If you're like me and love the gym, you might be in the gym 6 days a week.