Arizona Cardinals running back Rashard Mendenhall will retire. Yes, at the tender age of 26. How's that for a surprise to kick off NFL free agency? UPDATE: Rashard Mendenhall explains his retirement decision to HuffPo ESPN NFL insider Adam Schefter first reported this development. Mendenhall battled turf toe for much last season. When he finally got to be 100%, Mendenhall … [Read more...] about Cardinals RB Rashard Mendenhall explains his retirement