We talked about our own Allen Iverson being voted one of the "Toughest" athletes by Sports Illustrated!

1.  Tiger Woods
WHAT MAKES HIM TOUGH - Otherworldly talent, determination and focus that enables him to dominate his sport at 64 PGA wins and counting, including a recent streak of seven in a row. No one is better at sealing the deal when the heat is highest.

 2.  Lance Mackey
WHAT MAKES HIM TOUGH - Caginess and steadfast refusal to quit in the face of throat cancer (2001), hostile terrain and 40-below temperatures. He did the impossible in sled dog racing -- win the 1,000- mile Yukon Quest and 1,100-mile Iditarod within a month - not once, but in two straight years, most recently this year on frostbitten feet that hadn’t fully healed after the Quest.

3.  Anderson Silva
WHAT MAKES HIM TOUGH - You automatically qualify when people tab you as the world’s best pound-for-pound mixed martial arts fighter. Silva is 6-0 in the UFC, and ranked No. 1 in pound-for-pound polls by Fight Magazine.

 4.  Bob Sanders
WHAT MAKES HIM TOUGH - Few NFL players get more out of their body than the 5-8 Colts safety, who hits with the force of a much larger man. At 27, he’s in the prime of his career and brings presence on every play. “A lot of receivers know that when Bob is coming down, he’s going to try to knock himself out -- or you out,” says teammate Dwight Freeney.

 5.  Zdeno Chara
WHAT MAKES HIM TOUGH - If he were merely a fighter, he’d be the NHL heavyweight champ. If he were merely a shutdown defenseman, he’d be the Northeast blackout of 2003. Chara trains like a madman. When as fit as possible, he runs as fast, hard and long as he can until he collapses. He thinks athletes merely push themselves to 80 percent of their capabilities. He wants to find the outer limits.

 6.  Steve Smith
WHAT MAKES HIM TOUGH - What makes him tough: At 5-9 and 185 pounds, he’s a small guy who plays big. The Carolina wide receiver, 28, can beat slow corners with speed and speedy corners with power. In an SI poll last year, Smith was voted the most courageous receiver in football.

 7.  Allen Iverson
WHAT MAKES HIM TOUGH - Pound for pound, the Nuggets guard at 155 is the toughest guy in the NBA and he never takes a game off. “I’m used to being banged up,” says Iverson, 32. “You try to suck it up and not think about it. You just play off your adrenaline.”

 8.  Fedor Emelianenko
WHAT MAKES HIM TOUGH - Well, he’s the toughest heavyweight in the world, and maybe the greatest heavyweight in mixed martial arts. Emelianenko, 31, is 27-1-1 in MMA and is a 10-time Sambo tournament champion, including four World Combat Sambo Championships. Ruthless Russian strongman Vladimir Putin shows up on occasion to watch him.

 9.  Floyd Mayweather
WHAT MAKES HIM TOUGH - He’s the best boxer alive at 39-0 with 25 KO and has beaten Ricky Hatton, Oscar De La Hoya and Carlos Baldomir. At 31, Mayweather owns six world boxing championships in five different weight classes.

 10.  Chrissie Wellington
WHAT MAKES HIM TOUGH - The gritty Wellington, 31, won the 2007 Ford Ironman World Championship in Kailua-Kona, Hawaii, in her Kona debut. She’s the first British athlete to take the event. The month before, she made her Ironman pro debut and won in Korea. Stunningly, she’s admitted that she never used a heart-rate monitor or had a V02 max test, both required parts of any tri-athlete’s training manual.