There are many different exercise machines available. With some, they are for specific body parts, while others have multiple exercise options making them more versatile. Machines cater to cardio and strength training separately. Which machine you decide to buy is a matter of what your need is and your budget.
Any machine used for physical exercise is an exercise machine. There are all kinds of variations, some are loaded with a simple spring while others have electromechanical components. Certain machines also come with an ergometer that can measure the amount of work done.
There are machines for cardio such as the treadmill and rowing machine. Other machines are designed for strength building such as the leg press. Exercise machines come in a compound form as well, with multiple exercises possible within one unit. Such versions are very helpful to have at home, making up for a few different machines at the gym.
It is recommended that exercise machines be used along with other exercises. While using an exercise machine one is usually not using their stabilizer muscles. Mixing up one's routine helps get a more full workout.
It is important to note that exercise machines can also cause damage if not used in the correct manner and with the correct form. There are a lot of different machines that achieve a different purpose, which one decides to buy is a matter of what their end goal is and their budget. Some of these machines are available at nominal prices while others are much more expensive. The price variation is based on what kind of machine it is, whether it has digital parts or not and lastly the brand that produced it.