In using spinning bikes, there are some factors that you need to know. Always remember that the seating position makes a tremendous impact when it comes to injury prevention. If you are seating and the pedal is at its lower position, you should slightly bend your knee. You have to make sure that the handlebars are leveled correctly to slightly above. A very good cardiovascular exercise can be achieved by using spinning bikes. This machine targets primarily the quadriceps and the outer hips so make sure to always ask the instructor for proper position. Just remember that spinning bikes has lots of benefits that you can enjoy