what type of thing gets your adrenaline pumping more? snowmobiles, jet skis, and dirt bikes or skiing, wake boarding and mountain biking? i just started mountain biking this season and close to the end of the season i tried to get my brother out to join me. he wasn't too impressed and said he would rather go dirt biking, "more the the 'f--k yeah' and less with the 'oh f--k im tired" is how he worded it. i like mountain biking because of the speed, the amount of focus and concentration it takes and the pushing my physical limits. what's your preference and why?