Exercise cycles are for many people the ideal cardiovascular fitness equipment. Cycling is enjoyable for all ages, and on an exercise bike you can easily keep fit without missing your favorite programme. Upright exercise bikes are the most popular form and are more compact than most machines.An exercise bike may also suit those with injuries preventing them from running or walking. Recumbent exercise bikes can be a good choice if you have certain types of back problems while semi-recumbent exercise bikes make it easier for users to dismount. Most exercise bikes have magnetic resistance, which can give a superbly smooth and quiet ride. Air resistance exercise bikes are less quiet and popular but have a feel some still prefer.