Many home treadmills consist of adjustable incline settings

https://tread-millrwfd811.inkharbory.com/posts/treadmills-the-history-of-treadmills-in-10-milestones

Numerous home treadmills include adjustable slope settings, enabling you to imitate outdoor surface for more powerful legs and much better exercise variety, whether you're training for hills or burning more calories.