It is said that even workouts as short as 12 minutes or so have benefits. Of course the idea is that you need a little warm-up and wind-down time so that total time might be around twenty minutes but still it takes just a little time to get some results. When you consider though that you only burn about 300 calories in a thirty minute workout it makes it a little puzzling how you can make much progress on the weight loss front if you workout for really short times. One thing that can help is to make sure that whatever you are doing you get some serious muscle involvement going on. Riding a dual action bike like the Schwinn Airdyne exercise bike is a way to pull that off for example. In that way you get a much better chance to build some muscle and that is really the best way to move to boost your metabolism. Raising the basal metabolism is the real way to get control of your weight and burn fat too.