It depends on your goals. Do you want to get more fit? Do you just want to maintain your current fitness level? How fit are you now?
If you are very inactive and unfit, start off slowly. Do 20-30 minutes, four days a week. Be careful not to strain, and always warm up first.
If you are currently somewhat active and looking to improve your fitness, go for at least 30 minutes, five or six days a week. Then you can gradually increase it if you wish to become very fit. A very fit person would be putting in at least six hours per week.
You should include all components of fitness- cardio, strength, and flexibility.
So, for example, you could walk, bike or run 3 days a week and do weight training and stretching the other three. Never train the same muscles with weights two days in a row.
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A active male needs approx 2000 calories a day and a active female approx 1000 calories, but this differs from person to person cause of things like: age,weight,height and activeness these statistics are based on a male/female aged mid twentys about 6 ft in height with the male weighing 90kg's and the female weighing 65kg's....gee I can't believe I remembered all that, Harvard med done something right....
An active person needs more calories a day to provide them with energy that the less active person does not need.