Mtn/trail biking are awesome! I didn't start in earnest until I was ~32 realizing if I didn't find some cardio/aerobic/muscle building exercise I liked and would DO, I was gonna die. My hx of motocross/dirtbiking only supported the skills needed and fun that resulted for the past 20+ years. I prefer the sweeping twisty woods runs, but the downhill mtn runs are also killer fun. I still remember getting that 1st ever "2nd wind" that I thought was BS. That said, on one final joyous run down Gore Mtn in NY in Fall 2000, I lost control and crashed only to be hit in the upper back by a guy who I was riding with for the 1st time. Ended up breaking my collar bone as well as a bunch of ribs that were only identified after I went to the hospital at 10:30 pm after bringin' everyone else home. Man, I miss those days.
Get that bike, Dicko!!