Just as in life, there are no guarantees on a Bruce Arians-coached football team. You've got to work for what you get and keep earning your worth if you want to stick around longer than the next guy. It can be a brutally tough existence.
That's why it might be a perfect match, this intriguing new relationship between the Cardinals and veteran running back Chris Johnson, who was introduced on Tuesday after agreeing to a one-year contract with the club.
Arians believes there's plenty enough left in Johnson, the former 2,000-yard rusher, that he still "can hit a home run every time he touches the ball.