The 2012 NFL MVP had surgery on Feb. 7. He told ESPN's Josina Anderson in a telephone interview on the day of his surgery that he suffered the injury in Week 11 against the Lions, "but I didn't know the extent I was hurt then."
On Wednesday, he told reporters that he's "pretty much 100 percent."
"You know, me knowing my body I'd like to be a little stronger in some areas. But I'm feeling great," he told reporters.
He participated in all the Vikings' drills on Wednesday.
He had to work on the side during organized team activities last season after surgery to repair his torn ACL. Peterson said returning from the sports hernia surgery is much easier than trying to come back from major knee surgery, although he "earned a lot more respect for [his] abdominal muscles."
"It was a cakewalk compared to recovering from the ACL and what I had to go through to bounce back from that," he said.
Peterson finished last season with 2,097 yards, the second most in NFL history, shocking the league with his ability to quickly bounce back from his knee surgery. Only after the season did it come to light that he also had his MVP season while dealing with the sports hernia surgery suffered late in the season.
He said he was able to lift weights just more than a month after his surgery in February.
Peterson said it was important to him to participate in the voluntary practices as they are important to building "team chemistry." In all, 89 of the 90 players currently on the Vikings' roster were in attendance at Wednesday's session, with defensive end Jared Allen the only player absent.
Peterson said the OTAs are a good chance for veterans like himself to "let these young guys see how we do it when we're in here working. Hopefully they pick up from it."
While Peterson's presence was notable, so was receiver Greg Jennings' presence on the sideline.
The Vikings' major offseason addition injured his ankle during Tuesday's practice, coach Leslie Frazier said, adding that it's "nothing serious."