"Guys were a little out of shape, but we'll get them going," Harbaugh said.
"The group of receivers looked good today. Out of shape -- that's the bad news," Harbaugh said. "The good news is that it's a very talented group of those young receivers. You can tell that right away. The bad news is we've got to get them in shape. I don't know exactly what all these guys were doing for the last six months."
Jenkins has found his welcome-to-the-NFL moment. He was seen doubled over and having to kneel between snaps.
"When I got tired, I wasn't concentrating as much," Jenkins said, via Matt Maiocco of Comcast SportsNet Bay Area. "I'll fix that this (next) practice."
"Yeah, I need to get into shape, so I'll do it," Jenkins said. "I'm not going to challenge him; I'm going to try to do it with him."