What makes them tough:

They grew up on farms hunting deer and skinning rabbits.

Advantages: Lightning fast reflexes

What makes them tough:

Let's make this fair, and give them use of their horse.

Advantages: With the horse, they have well over 1,000 lbs of muscle on their side.

What makes them tough:

Being able to take 90 MPH fastballs to the scapula.

Advantages: Roid rage

What makes them tough:

Basketball players are from the street. They learned how to street fight and that means fighting dirty.

Advantages: They'll break out a gun if they are losing.

What makes them tough:

If two-a-days weren't tough, how about a 300 lbs defensive lineman hitting you from behind at full speed. Pads or not, there's a reason why there are so many injuries in football.

Advantages: They regularly take people's head off.

What makes them tough:

Guys that take slap shots to the grill on a regular basis, and think nothing of it are tough.

Advantages: Balance. I can hardly stand on ice, let alone fight on it.

What makes them tough:

Best illustrated by a story...An Australian rugby player Ben Czislowski clashed heads with another player causing him to lose several teeth, and break his jaw. He thought "Nothing serious, happens all the time". 4 months later he had an eye infection and shooting pains until doctors discovered the cause. One of his teeth was embedded in his head...

Nothing serious...happens all the time....

Advantages: Lack of knowledge that they are getting face caved in