INDIANAPOLIS – Normalcy has returned to the Indianapolis Colts.

This part of the offseason for the Colts calls for teams to be able to participate in offense/defense drills, the first such time they've done this since the final stages of the 2015 season.

Back then Andrew Luck was merely an observer.

That's no longer the case.

The booming cadence of No. 12 bounced off the inside of the Colts' indoor facility on Tuesday.

More importantly, though, Luck was back throwing the football.

"He looks really good," Chuck Pagano said of his franchise quarterback after the team's second of 10 OTA sessions this offseason.

"I think he's just really, really happy to be back on the football field and playing football. He's always been a gladiator, if you will, when it comes to preparation."

A healthy Luck has "no limitations" with the quarterback showing off an array of throws, from inside and outside of the pocket, on Tuesday.

Luck has always been a staunch promoter of what can get done on the practice field. That holds even more truth after he missed virtually the entire final two months of last season.

"I've always loved practice," Luck says. "And when something is taken away from you, it obviously gives you more appreciation of it.

"These certainly are very important steps in building a team and getting ready for next year."

Along with making sure he's back and healthy, Luck is busy forging a relationship with the "conscientious" Ryan Kelly.

The quarterback has already been impressed by what the rookie center has shown in a couple days of team work. Getting to know each other away from an 11-on-11 setting is also something the two are starting to build.

What Kelly is observing from Luck on the field is a quarterback very disciplined in his fundamentals this offseason.

That's where work has begun in 2016 for Luck, as he tries to return to Pro Bowl form, while staying far away from being just a spectator during practice.

"I have an obligation to keep myself healthy, not only to myself but to this team," Luck says.

"If that dictates change in preparation a little bit and how you do things then I have to (alter my game). For example, if a play breaks down in practice, making a full-speed decision to throw it away just to train that aspect of it. Every year I think every player is going to want to improve. If you've been deficient, you're going to want to change in that area."

Such modifications are coming, in the setting Luck is most comfortable in---back to practice.