The veteran spent the bulk of Wednesday's session running on a side field as he tries to recover from offseason knee surgery.
"Everything is good, just getting back in shape and getting me knee right," Manumaleuna said. "[I] should be ready for training camp. [The biggest thing now is] getting comfortable to put the pressure you need to put on it for a football season. That's just the main thing, getting comfortable with certain angles, certain routes and movements.
"It's frustrating, because it's a new team and you want to win the trust of your teammates. It's one of the those things you have to deal with."
Unlike most of his new teammates, Manumaleuna already has a fundamental understanding of the offense, having previously spent time with offensive coordinator Mike Martz in St. Louis.
"We kind of ran the same system when I was in San Diego also, so I didn't get too far away from what he does," Manumaleuna said. "Not mentally, just physically got to catch up with a few things, but I'll be fine mentally."
In addition to Manumaleuna, safety Chris Harris, linebacker Pisa Tinoisamoa, running back Chester Taylor, defensive lineman Henry Melton, center Olin Kreutz and punter Brad Maynard were held out of Wednesday's workout.
Jeff Dickerson covers the Bears for ESPNChicago.com and ESPN 1000.