Tim Knoll, BMX rider; when gymnastics meets BMX http://www.redbull.com/en/bike/stories/1331769920267/tim-knoll-pulls-crazy-bike-stunts-in-berlin-red-bull
How did the two hobbies meet?
Is it therapeutic?
What is his biking/BMX background?
560-Lb Man Biking Across US to Save His Marriage http://www.newser.com/story/210246/560-lb-man-biking-across-us-to-save-his-marriage.html and http://www.fatguyacrossamerica.com/my-story/
Why bike riding? Why not personal trainer or other method of exercise?
