7 or "Why?"

For the past few months, I have been riding my bike as often as I can. Last month, I rode about 90 miles and this month, I am closing in on 100 miles. A few days ago during practice a teammate asked me why I have been biking as much as I have. The past few weeks, I have biked about 90 miles on a silly single speed bike. To be honest, I bike so I can become stronger and a more powerful roller derby player.