The former Kansas City Chiefs linebacker was known for his trademark kamikaze wedge-busting booming ways on special teams where he made 49 tackles in his first three seasons. He was brought to the Dolphins, mostly on the word of Dolphins running backs coach James Saxon -- who held the same position in Kansas City where Grigsby was opening holes up for Pro Bowl running backs Priest Holmes and Larry Johnson -- to compete at fullback with Reagan Mauia and fortify special teams.

"I think Boomer makes it because he is a physical guy and not afraid to do those things," Dolphins coach Tony Sparano said. "This is a guy who runs down the field on kickoff team and has gone through wedges. So I think that he's used to doing some of those things and (that) makes it a little bit easier."

The 5-11, 249-pound Grigsby has toned down his hell-for-bent style to focus on making the tackle.

"Early in my career I kamikazeed a little bit more than I did later because I was so jacked up and adrenaline-bent to run downfield and crash into something, I kind of ignored the fact that maybe I want to make the tackle," he said. "If I got to hit it I'm going to hit it, but most of the time I'm going after the ball."

Grigsby said he switched to fullback because Chiefs coach Herm Edwards suggested it, and also he wanted to remain in the NFL.

"You got to do what you have to do. I loved the NFL. I was going into year three and still under contract in Kansas City and the best opportunity for me to stay playing was at fullback. I never played it in my life until last season and I feel like I found my calling," he said.

Despite receiving plenty of hits in the helmet, Grigsby is already preparing for life after football by attending the NFL's business management and entrepreneurial program. He has taken courses at Harvard Business School this offseason and Northwestern's Kellogg School of Management last summer.

"You can't play ball forever. You don't want to go from the penthouse to the outhouse," he said. "I plan on stacking up the golden tickets on the resume, put it in very bold, make sure I increase the font up a couple, maybe italicize it and underline it to make sure everyone knows I went to those business schools."

Still, Grigsby won't be seeking a desk job.

"More a marketing salesman, my major at Illinois State," he said. "I see myself being out front shaking hands and kissing babies and spending company money."

But for now, Grigsby is quite content to open up holes for running backs Ronnie Brown and Ricky Williams, while contributing on special teams.

"Ricky came out in '99 when I was a senior in high school," Grigsby said. "He's still doing his thing.

"I love everything we've done here. I love the way the entire blueprint of the entire foundation's been set here. I'm pretty excited for it. You're going to see an entirely new football team."

CAMP CALENDAR: Camp opens Saturday, July 26 and closes Aug. 14 to the public, with the first preseason game slated for Aug. 9 against the Bucs. There are no intra-squad scrimmages scheduled.

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