Horizon Fitness CST4 Treadmill Horizon Fitness Updated September 15, 2021 20:17 For the 2005 Horizon Fitness CST4 Owner's Guide, please click here. For the 2005 Horizon Fitness CST4 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 CST3 Treadmill Comments 0 comments Please sign in to leave a comment.