LeBron James, Cristiano Ronaldo, Usain Bolt Top SI's Fittest Athletes List

Professional athletes do their best to stay in shape to boost their performance. However, some do it better than others.

Sports Illustrated put together a list that ranked the 50 fittest athletes in sports. It rated athletes on speed, strength, agility and endurance. Each category was based on a scale of 0-10, so a perfect score would be 40.

There aren't many surprises near the top of the list.

Rank	Athlete	Sport	Speed	Strength	Agility	Endurance	Total
1	LeBron James	Basketball	10	10	10	10	40
2	Cristiano Ronaldo	Soccer	10	8.5	10	10	38.5
3	Usain Bolt	Track	10	9	8.5	9	36.5
4	Floyd Mayweather	Boxing	9	8	10	9	36
5	Dez Bryant	Football	9	9	8.5	8.5	35
6	Calvin Johnson	Football	9	9	8.5	8	34.5
7	Serge Ibaka	Basketball	7.5	9.5	8.5	8.5	34
8	Adrian Peterson	Football	8.5	9	9	7	33.5
9	Jon Jones	MMA	7	10	8	8	33
10	Michael Phelps	Swimming	9	7	8	9	33

Given LeBron James' recent dietary change, he has a pretty good grasp on the top spot.

Check out the full list at SI.com.