Many home treadmills include adjustable incline settings

https://treadmillspkrw486.birchreport.com/posts/the-top-buy-treadmills-online-gurus-are-doing-three-things

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