Despite winning his second championship in just three seasons with the Miami Heat, LeBron James has had a very busy summer and has been very eager to get back into the gym.

The reigning league MVP says he's motivated by the moves he's seen being made around the league during the offseason and he's prepared to defend his team's back-to-back titles, according to the Sun-Sentinel.

"I've been back in the gym for a few weeks now, going at it," James said. "I've seen what so many teams have done to get better. I've seen the moves that we've made, so I've got to do my part." After leading the Heat to a second straight NBA title, James took a brief break to run a high school All-American camp in Las Vegas, made an appearance at the ESPY Awards in Los Angeles and then toured China on marketing trip for Nike. The fun ended once rosters began to take shape.

The Heat return most of their core from last year, recently adding center Greg Oden to keep pace with the improving contenders. James said being patient is the key with Oden, the 2007 No. 1 overall pick who has only played 82 games because a series of knee injuries. His last game was Dec. 5, 2009. "We're not going to put any pressure on him," James said of Oden. "He hasn't played in almost four years. We want him to work his way back into shape. It's going to take him a while to get back into game shape ... We don't expect anything out of him except being a professional and showing up for work everyday. Whatever we get from his is extra."

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