It depends on who the opponent is. President Obama is very fit and plays a lot of Basketball, but it is not clear how good his skill at arm-Wrestling is.
Barack Obama
No, you can't :)
i would win
The GSG9 would win. The SWAT would win. And there you have it.
Wolverine would win, unless you are Wolverine. Then he'd still win. If talking about the animal, you would win.
I would win.
Luffy would win, but it would be hard.
chargers would win
A monk would win.
crocodile would win
reptile would win
a spider would win.