Horizon Fitness TSC4 Treadmill Horizon Fitness Updated September 14, 2021 20:53 For the 2003 Horizon Fitness TSC4 Owner's Guide, please click here. For the 2003 Horizon Fitness TSC4 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.