Hi: After porking up 35#, I've decided to get back in shape. I've just started riding a bike as part of a cross training program leading to a half marathon. I'm totally new to cycling and looking forward to purchasing my first new bike since childhood. I've commandered my son's mountain bike as an interem measure. As I'm perplexed as to what to buy and what frame size I need. This inspired me to join this forum and post my first message. I'm looking forward to corrosponding with other members on this fine forum.