Bicycles/Buying a Bicycle
Purchasing a bicycle can be easy for experience users and slightly difficult for new users. You need to understand what you want to get out of your bike. Mountain Bikes are good for what's in the name, mountains, climbing, going uphill because their gear ratios make pedaling easier. If you tend to stay urban you may need to stick with a standard Mongoose, Huffy city bike. These are made for simple rides good for speed but tend to put more pressure on your legs.
In European countries, bike shops are very common because their use in the country over vehicles, In the United States bike shops are around but not as common as Europe. In America it is common to see a child on a bike but not a older adult due to it being more common for older adults to have motorized vehicles. Large retail stores, such as Wal-Mart, commonly have a selection of bikes but they are sometimes cheap or poorly made. If you want a durable bike you would need to go to a bike shop and get a bike from a reputable company.