No one would ever question the toughness of new Ravens fullback Vonta Leach these days. Respect for him soars every time he knocks another NFL linebacker to the ground.

Yet brawn is only part of the reason why Leach is the league's highest-paid fullback playing right now. For the Coke Machine, a nickname that comes from his compact shape, his journey has always been about believing.

Leach never doubted his ability when he was an undrafted rookie out of East Carolina in 2004. He never thought his football career was over when he was cut twice in two weeks in 2006.

Every time he got on the field, he shoved around defenders to open holes, making teams take notice of a position that often is forgotten. By the time he hit the free-agent market this year, there were five teams lined up to sign him.

Leach had gone from just another NFL body to the league's best bodyguard.

"I knew I could always play in this league," Leach said after signing his three-year, $11 million contract with the Ravens. "I knew I always belonged."

Leach's job is a simple one. The 6-foot, 255-pound fullback formerly of the Houston Texans crushes into a linebacker or slams a defensive back on his back.

But that's not his sole purpose on the team. He takes it upon himself to provide the team with leadership and laughs.

According to the Houston Chronicle, he showed up at practice on Halloween Day last year in a Spider-Man costume. And when Texans tight end Owen Daniels began a Pro Bowl campaign by making "Vote for OD" T-shirts two years ago, Leach walked around with a homemade one that read: "Vote for me."

"You can't be a mean man all the time," Leach said. "You have to smile. I am a laid-back guy. On the football field, I turn into a different animal."

Leach can't practice with the Ravens until the players' union recertifies on Thursday. That didn't stop him from making himself at home.

At his first practice, Leach had his arms around guys and was even coaching them.

"You would have thought he has been here for a month," offensive coordinator Cam Cameron said.

This isn't the first time the Ravens players met Leach. It was just last year that Leach led the way for Arian Foster to gain 100 yards against them.

That marked only the third time the Ravens had given up 100 yards to a running back that season. And Leach certainly made an impression.

"I have only played against him one time, but I truly have been a fan of his for years," linebacker Ray Lewis said. "He plays the game the way it should be played, old school, hard-nosed and with passion. I am excited to have him on our side."

Leach's presence and personality are expected to invigorate a sagging Ravens rushing attack. After ranking in the top-5 in 2008 and 2009, the Ravens finished 14th in running the ball last season.

Six days into free agency, the Ravens made Leach the first free agent they signed from another team.

How excited are the Ravens? When reporters asked Ray Rice about the acquisition of Leach, the running back started dancing while singing "I'm So Excited."