The 49ers have a monthlong vacation before training camp begins, but don't expect to see Frank Gore, a Miami native, sipping pi?a coladas on South Beach this July. Instead, Gore will be a few miles to the west of the Miami beachfront, laboring up and down one of the highest hills in South Florida while tethered to a truck tire. It's a grueling regimen Gore has performed since high school, and no amount of fame or money -- the Pro Bowler signed a $28 million deal in March -- will change that. "You've got to sweat if you're going to be successful in this sport," Gore said this week.