Jerod Mayo missed the majority of the 2013 season with a torn pectoral muscle. While he said it feels good to be be back on the field for OTAs and participating fully, he won't really know how his chest will hold up until the team puts on pads.
Mayo is one of a handful of players working their way back from season-ending injuries as they prepare for the upcoming season.
Both Vince Wilfork and Tommy Kelly appeared to be full participants in Thursday's OTA session that was open to the media. Rob Gronkowski took part in a handful of drills with rehabbing players on Thursday before heading into the Dana Farber Field House after a few minutes of on-the-field work.
During OTAs players have been wearing helmets and shorts. Pads won't be introduced until training camp in July. (The official start date of Patriots training camp has yet to be announced, but it could begin as early as July 23.)