Backup running back Toby Gerhart remembered earlier this week what it was like to get hit a lot on a Sunday. Stay tuned to see if he will experience the feeling again early next week. Vikings star Adrian Peterson is battling a groin strain. Coach Leslie Frazier said Wednesday he is "cautiously optimistic'' Peterson will play Sunday at Green Bay, which means the understudy could get the call or at least another increased workload. Gerhart didn't carry more than one time in any of Minnesota's first nine games. But he had seven attempts for 67 yards in Sunday's 41-20 loss at Seattle, three of those carries before Peterson was pulled for good in the lopsided loss. "It was just fun,'' Gerhart said of getting extra action. "It felt like the first time I'd played in a while. I woke up sore and (thought), 'Wow, that is what it feels like to get hit again.' '' Gerhart had just four carries for 28 yards before the Seattle game. "I just do my thing every week,'' Gerhart said. "I go out and practice hard, and if my number gets called in the game, go out there and try to execute.'' Peterson has played in 26 straight Minnesota regular-season games. After carrying 21 times for 65 yards against the Seahawks, he said his groin was "bothering me a lot.''