I can't believe pro-fishing is set as the lowest. it takes years of biologicle study, tedious training, extremely good boat driving skills (to avoid the occassional moron on a jet-ski, and to handle rough water), sight, and motor skills. It's not the toughest on your short bursts of energy like hockey or football, but a 4-day tourny in rough weather will beat the sh!t out of you like nothing else. (imagine sitting in a poorly coushioned chair free falling 5-6ft on a concrete floor repeatedly for 3-4 hours a day) pro-golf should be at the bottom of the list, at worst you pull a shoulder/back muscle.
I used to play football, baseball, and ran cross country in high school, and gorilla basketball with friends during the summer, and occasionally played golf on the weekends. None of these where as tough as fishing a 1-day bass tournament. (I fished in the pro-am division of anglers choice while in college)