Exercise is supposed to be good for you - and by most measures, it is. However, cycling has a little secret: too much of it is bad for your bones, and you might never know you're doing damage until it's too late.
What makes it so dangerous is that there are few to no symptoms of low bone density, it can occur at any age, and it is notoriously difficult to reverse, especially later in life. Demanding endurance sports like cycling and swimming are increasingly being studied to understand how they can negatively affect bone health.
