At the podium: Tyler Zeller

Tyler Zeller admitted Friday that showing people he could do "more than they thought" last year was a great source of happiness for him.

The big man really blossomed with the Celtics in 2014-15, displaying a solid touch around the basket, accuracy from the midrange and effectiveness as a roll man in pick-n-roll sets.

As a member of an extremely crowded front court, Zeller will have to do all that and more if he wants to reserve a significant spot in Brad Stevens' rotation this season.

A @ZellerTyler #selfie #CelticsMediaDay pic.twitter.com/cvHEIxYoiV

— Boston Celtics (@celtics) September 25, 2015

An improved selfie game alone simply won't cut it.