Houston Texans running back Arian Foster spent most of Tuesday's organized team activity practice in the training room after suffering what coach Gary Kubiak called a strained right calf muscle.
Kubiak said the injury wasn't serious and that Foster is day-to-day. He left the field on a cart with a bag of ice on his right leg.
Foster had a league-leading 351 rushing attempts for 1,424 yards and 15 touchdowns in 2012, when he started all 16 regular-season games for the first time in his four pro seasons.
In three years as Houston's fulltime starter, Foster has averaged 318.7 carries for1,421 yards.