Horizon Fitness CST4.5 Treadmill Horizon Fitness Updated September 16, 2021 19:48 For the 2006 Horizon Fitness CST4.5 Owner's Guide, please click here. For the 2006 Horizon Fitness CST4.5 Exploded Diagram, please click here. Was this article helpful? Yes No 0 out of 0 found this helpful Have more questions? Submit a request Comments 0 comments Please sign in to leave a comment.