Kettler axos cycle m exercise bike the kettler axos cycle m exercise bike is ideal for those who just need to jump on and start cycling straight away without having to waste time inputting information its a simple well built fitness machine that will start as soon as you start pedalling the fitness recovery test can become very addictive as it will monitor your fitness levels every time you use the machine and will give you a fitness rating mark so that you can see how well you are de