By: Alex Del Barrio Sportsradio 610By Alex Del Barrio

MIAMI (CBS HOUSTON) – Former Houston Texans running back Arian Foster announced his retirement from the NFL on Monday night through a personal letter posted on the Uninterrupted Twitter account.

Foster, 30,  signed with the Miami Dolphins in the offseason after spending seven seasons with the Texans from 2009-15.

Foster says in his letter, “There comes a time in every athlete’s career when their ambition and their body are no longer on the same page. I’ve reached that point.”

Foster continued, “My father always said, ‘You’ll know when it’s time to talk walk away.’  It has never been more clear than right now.”

Foster thanked the Miami Dolphins for making the decision to retire easy for him and allowing him to,  “bow out with grace.”

Foster has battled with soft tissue injuries his entire career and started just two games for the Dolphins this season as he’s dealt with hamstring injuries throughout the season.

Foster, a four time pro bowler and a 2010 first-team All-Pro, finishes his career with 6527 rushing yards and 68 total touchdowns. Foster won the NFL rushing title in the 2010 season.

Alex Del Barrio  and Matt Murphy can be heard on Saturday afternoons 4-7 pm  Follow Alex Del Barrio on Twitter: @alexdelbarrio