Trying to figure out what type of portable exercise bike to buy can be difficult because there is so many different types to choose from. Firstly, make sure the machine has different setting levels of resistance. With different levels you can train the muscles into working out harder. In addition, the machine should be light weight and easily movable to do other body part workouts such as the arms. Portable bikes have different purposes for each individual, from weight loss to curing boredom. Sometimes they also come with software that allows you to keep a record of your entire workout series and improve your exercise pattern over time. Staying excited about your workouts come from actually seeing the effort over time, so make sure to keep track.