Phil Costa, the 26-year-old center who abruptly announced his retirement just weeks after signing as a free agent with the Colts, says he did it because football wore him down.

“Unfortunately, the day-to-day physical rigor of the NFL season has taken a toll on my body and has been a driving force behind my decision,” Costa said in a statement, via the Dallas Morning News.

Costa missed most of the 2012 season with the Cowboys because of back and ankle injuries, and he struggled to return to form in 2013. But Costa doesn’t sound like he has hard feelings toward the NFL.