SAN DIEGO -- One of the more impressive things during offseason workouts for the San Diego Chargers was watching how efficient quarterback Philip Rivers ran the offense.

Rivers seemed to pick up where he left off last season. Few balls hit the ground during two-minute drills, as Ladarius Green, Keenan Allen, Malcom Floyd, Vincent Brown and Eddie Royal made catches all over the field.

Add to that a diverse group of running backs in Ryan Mathews, Danny Woodhead and Donald Brown playing behind an experienced offensive line, and the Chargers should have one of the best offenses in the NFL for a second straight season.

“I think they did a nice job,” San Diego coach Mike McCoy said. “For a majority of the guys it’s their second year in the system, so that’s going to come with time. The more you’re in a system, the more comfortable you are. And if you have a quarterback like Philip Rivers, good things are going to happen.

“He gives you an opportunity every weekend to go out there and win on Sundays. Some of the other players stepped up. Vincent had a great camp and did a nice job. It’s great to have Malcom back out there. We’ve got plenty of backs that are doing a great job. So we’re looking forward to it. But we’ve got a lot of little things to work on come training camp.”

Rivers said he treated the final week of offseason training during the team’s minicamp like a game week, focusing on executing the little things during 7-on-7 passing drills and team drills. And that laser-like focus seemed to pay off.

“This week mentally I said to myself, ‘All right, we’re playing a game,’ ” Rivers said. “So for these next three or four practices, lets treat it exactly like a game, and be that zeroed-in on your reads, discipline and those kinds of things. Not that you ever relax. But the offseason is a time to venture out a little bit on the practice field.”