Many home treadmills include adjustable incline settings

https://home-treadmillsziko267.clearhavendigest.com/posts/the-top-5-reasons-why-people-are-successful-with-the-uk-treadmills-industry

Lots of home treadmills consist of adjustable incline settings, allowing you to imitate outside terrain for more powerful legs and better workout variety, whether you're training for hills or burning more calories.