problaby troy polamolu or bob sanders
there is no single player who trains the hardest. However, it is typically the older veterans who spend the most time conditioning in order to stay in shape. The older you get, the harder this becomes. If I were to pick out three of the hardest working players I would have to say Roger Clemens, Tom Glavine, and Jamie Moyer.
Floyd Mayweather Jr
One NFL player who is famous for some of the hardest hits is Ray Lewis of the Baltimore Ravens. Clay Matthews (Packers) and James Harrison (Steelers) are also on the list of hard hitters.
The fittest athlete is the one that trains the hardest.
Definitely line-backer wise it's either Ray Lewis or Patrick Willis.
The hardest hitter is Ray lewis, second Clay Matthews.
Ray Lewis or Clay Matthews
Seattle Seahawks Quest Field