How to lubricate the belt on a Horizon treadmill the easy way without loosening the belt. I got a bottle of treadmill silicone lubricating oil from Amazon with a flexible nozzle on it that allows you to get the the silicone under the belt without loosening the belt.
There are other options though including a large syringe with a long hose on it that can also reach under the belt without loosening it.
I go over the options, show what I use and how I prepped it, and then go through the process of lubrication. I also describe how to reset the "Lube Belt" message on the Horizon 7.0AT on both the standard and sporting goods store console variants.
Note: for the Dick's Sporting Good and Canadian Tire variants - the process is to press and hold the Play/Pause button along with the Stop button - I made a mistake in my video on that one.

0:00 Intro
0:48 Options discussion - syringe
4:24 Horizon syringe method
8:36 Spot On Treadmill Lubricant - intro and setting up measurements
11:38 Review of Horizon 7.0AT manual lubrication method - cons
12:12 Horizon syringe method versus mine
15:29 Start of lubrication
17:03 Run the treadmill without being on it
17:40 Walk on the treadmill to complete the spreading of the silicone
18:07 Walk around the treadmill to ensure all the oil on the deck makes it to the belt
18:45 Reset Lube Deck notification
19:07 Dicks Sporting Goods and Canadian Tire console Lube Deck notification reset
20:10 Conclusion

Horizon video for use of a syringe with a long nozzle / hose:
https://www.youtube.com/watch?v=yDhl9ghYua0

Syringe option from Amazon.ca:
https://www.amazon.ca/Silicone-Treadmill-Lubricant-Lubrication-Treadmills/dp/B09GV9HF5Q/ref=sr_1_2?crid=1RU3MZQISE6QF&keywords=syringe%2Bfor%2Btreadmill%2Blubrication&qid=1672668401&sprefix=syringe%2Bfor%2Btreadmill%2Blubrication%2Caps%2C95&sr=8-2&th=1

Link to what I used on Amazon.ca:
https://www.amazon.ca/gp/product/B019BKEDSE/ref=ppx_yo_dt_b_asin_image_o01_s00?ie=UTF8&psc=1