Risner (back) was working in the weight room during practice Thursday, Andrew Krammer of the Minneapolis Star Tribune reports.
Risner has been on IR since Aug. 28 and is eligible to return next week. He still can't practice with the team, but his ability to work out in the weight room is a positive sign of his progress from his back injury. Risner could be designated to return ahead of the Vikings' Week 5 matchup with the Jets.