The interior color scheme is cool, and the use of black metal frames for the bar chairs and coffee table help to create a light and airy room. Rugs are very useful in home decorating. Not only do they give interest and provide a soft surface to walk on, but they can also 'mark out' areas such as this one.
On a treadmill, you can accurately set your incline by 1%, 2%, etc. When walking outdoors, you need to use a tool such as MapMyWalk.com to map out your walks and see what the incline really is. I can tell you from experience, that a 5% incline is a real huffer-puffer. 1  for every 1% of grade, you increase your calories burned by about 12% or about 10 more calories per mile for a 150 pound person.  By the time you are at 10% grade, you are burning over twice as many calories per mile.
For a walking surface grade between +6% to +15% inclusive, this walking calorie burn calculator is based on the American College of Sports Medecine (ACSM) metabolic equation for walking oxygen consumption (i.e. VO2), with a subsequent conversion from VO2 to calorie burn included by ShapeSense.com. These equations are shown below. This walking calorie burn calculator will not return a calorie burn estimate for walking speeds below 1 kilometre per hour (0.62 miles per hour) or above 7.5 kilometres per hour (4.66 miles per hour). Calculator Formulas. The units for the constant 3.5 are milliliters of oxygen per kilogram per minute.