I don't know if anyone is looking at this anymore, but as far as the most demanding sport goes.. It's hard to say. Everyone wants their sport to be the most demanding! I'd say swimming is harder than soccer and wrestling easily. I don't know about wrestling, but soccer practices (I was on a team that traveled around the zone- farthest tourney was Indiana) were way easier than some of my swim practices are! I did one a day practices in soccer and in the summer we do 3 a day swim practices, over 5.5 miles a practice. When I add that up, thats about 16 miles a day. Hmm... Thats more than I would run in a week! (Walking doesn't count). Of course, motocross is above swimming easily for manliness, and it is defiantly hard to ride a bike. But as far as cardio goes, swimming is amazing. One last thing: motocross is very hard on your body. Swimming is the easiest sport on your body... they kind of balance out, you know
Rock climbing, swimming, mx... they are all awesome sports! Who cares whats hardest?