Lots of home treadmills consist of adjustable slope settings

https://home-treadmillsfnay710.northvaledigest.com/posts/the-steve-jobs-of-portable-treadmill-meet-your-fellow-portable-treadmill-enthusiasts.-steve-jobs-of-the-portable-treadmill-industry

Lots of home treadmills include adjustable slope settings, allowing you to replicate outside terrain for more powerful legs and much better exercise range, whether you're training for hills or burning more calories.