Usually, many diving areas which receive an important amount of visitors do not maintain their natural characteristics due to this interaction. These areas often receive visitors who are willing to touch what they see and take something from sea as a souvenir and this way they change general structure which sometimes changes dramatically as time passes by and sum of visitors produce their effect on landscape.

* First, they save time. People say they don't have enough time to spend at work or with their family, so how could they have time to go to gym. Treadmills save time because gym is now brought to you.

* Second, there are no more monthly or yearly gym fees. You have to renew your gym membership at least once a year and a typical treadmill will serve you up to 10 years or more.

* Third, there is convenience factor. In time it would take you to get ready and drive down to gym, you could have already got 20-30 minutes exercising on treadmill in your home.

* Fourth, it works for whole family. As with most gym equipment that requires age to use some of heavier stuff, a treadmill only requires that you can walk to use it because it can set speeds for you and your family.