PORTLAND, OREGON -- 05/11/2011 -- From 1987 to 1995, participation in in-line skating spiked 634 percent, but those are bygone days for the sport of Rollerblading as a case full of waiting rentals at Oaks Park demonstrates. The fastest-growing individual sport over 2000-2010? Try trail running, whose number of participants increased 23 percent to 5.1 million. Brian Feulner/ The Oregonian