Texans running back Arian Foster led the NFL in rushing last season while playing with a torn meniscus in his right knee. Foster kept the injury secret because he feared he'd lose his job. "My responsibility and my job is to make sure the people in the front office don't replace me, because every single day they're looking to replace me," Foster said. "And so I have to make sure I block with the best, run with the best and catch with the best. That's my job."