Sentence:  Cycling has created the phenomenon of the <WSD>MAMIL</WSD>—Middle-Aged Men In Lycra—because it's enjoyable, it's accessible and it's easy to take up. All you need to know is how to ride a bike. 
Meaning of the word marked with <WSD> tags:  (nodot=1): a previously non-athletic man, between 35 and 50, who has taken up cycling seriously for health and/or social reasons.