Horizon Fitness DT680 Treadmill Horizon Fitness Updated September 21, 2021 22:43 For the 2007 Horizon Fitness DT680 Owner's Guide, please click here. For the 2007 Horizon Fitness DT680 Exploded Diagram, please click here. Was this article helpful? Yes No 0 out of 0 found this helpful Have more questions? Submit a request Related articles Horizon Fitness Elite 3.0T Treadmill Comments 0 comments Please sign in to leave a comment.