Denver Broncos quarterback Peyton Manning still is getting used to the idea that his arm never will be as strong as it was before his four neck surgeries, but he's already throwing better this offseason than he did in last season's playoff loss to the Baltimore Ravens.

"We worked out at Duke in March or April, and I definitely felt like he had more zip on the ball," Broncos wide receiver Eric Decker said Wednesday, via The Denver Post. "I think he's come back stronger."

Decker's observation from the Duke workout jibes with that of Demaryius Thomas.

More importantly, Manning feels the difference himself.

"I feel much more comfortable than I was last year. I am stronger than I was last year," Manning recently told Pete Prisco of CBSSports.com. "I am throwing the ball better now in May of 2013 than I did in May of 2012 -- significantly better. I got better throughout the season."