Checking out ifit.com to see what benefits it may hold.  I've run 5K, greatest distance run is 8 miles, temp runs at 6 mph, contemplating half marathon.  Should I concentrate on becoming more competitive in 5K or 10K?  Goals aren't so much to win, but more so to have a respectable finish.  Looking for advice, motivation from seasoned runners/racers or for others like me!