Try to avoid watching TV or reading a magazine because this reduces your workout intensity. Aim for a minimum of 15 minutes, maximum of 60 minutes. The treadmill is the most commonly-used aerobic exercise machine. Now it's standard equipment in every gym. Walking is the most natural of human movements, so exercising this way is the often recommended by doctors and fitness advisors.
Many people wonder why walking outside seems like harder work than walking on a treadmill.
The only thing you need to do is lift your legs. The results are considerably better. Try walking for two minutes and running for one minute, alternating back and forth for a total of 30 to 40 minutes. Another method of interval training is to start at the easiest setting, then increase either speed or elevation every minute for the first ten minutes. How many calories you burn at any particular moment is less important than making sure your exercise is consistent.