A curved treadmill looks different from a standard flat-belt machine right away. The running surface bends upward in a pronounced arc, and there is no motor driving the belt. Instead, the belt moves only when you move. One curved treadmill manual (the Assault Fitness AirRunner) states plainly that the unit is non-motorized and that the user initiates and controls the speed of the running belt. That single fact shapes how you start, stop, maintain, and stay safe on a curved treadmill.
How a curved treadmill works
On a motorized treadmill, a motor turns the belt at a set speed. A curved treadmill has no motor. The belt is shaped like a shallow arc, and it moves freely in only one direction, as the AirRunner manual explains. When you place your foot on the front of the curve and push backward, the belt rolls under you. The harder you push and the farther forward you step, the faster the belt moves. To slow down, you simply move your feet toward the middle or rear of the curve and reduce your effort. Because there is no emergency stop button, the treadmill will slow to a stop on its own once you stop moving.
This design means you are always in control of the pace. The manual warns that the belt moves freely in only one direction. If you are used to a motorized treadmill, it can take a few sessions to learn how to start smoothly and maintain a steady rhythm. For a broader look at how manual machines compare, see our manual treadmills page.
Mounting, starting, and stopping safely
The AirRunner manual provides specific instructions for getting on and off. Grasp the handrails whenever you mount or dismount the treadmill. Never attempt to mount or dismount while the belt is moving. Never jump onto the treadmill, and never jump from it. Always face forward and operate the treadmill only when you are facing the console. The manual also states that you should never enter the treadmill from the front.
Because there is no motor to start or stop the belt, the process is different from a standard treadmill. To begin, stand on the side rails with your hands on the handrails. Then step onto the belt and start walking slowly. To stop, simply slow your pace and step onto the side rails once the belt has nearly stopped. The manual reminds users that there is no emergency stop feature, so you must always stay in control of your speed. If you feel unsteady, slow down gradually and use the handrails for support.
Children and pets should be kept away from the treadmill at all times. The AirRunner manual says children under the age of 16 should not use the machine, and children should not be left unsupervised around it. Do not allow animals on the treadmill. Before each use, examine the treadmill for loose or worn parts and tighten or replace any components as needed. For more on routine checks, visit our treadmill safety checks guide.
Clearance and placement
Where you put a curved treadmill matters for safety and ease of use. The AirRunner manual lists minimum spacing recommendations based on a combination of ASTM voluntary standards and European regulations as of March 2017. It advises a minimum of 0.5 meters (19.7 inches) to the left, right, and front of the treadmill, and 2.0 meters (79.0 inches) behind it. These clearances allow for safe access, passage around the machine, and an emergency dismount if needed. The manual also notes that the actual area required is the responsibility of the facility, and you should consider total space needs for training, as well as any local, state, and federal regulations.
Place the treadmill on a solid, level surface. The manual says not to use the treadmill outdoors. The machine is heavy (the AirRunner weighs 280 pounds, or 127 kilograms), so if you need to move it, get help and use proper lifting techniques. The manual provides transport instructions: with a second person, grasp the transport handle and raise the rear handle, then roll the unit into place. Never grasp the unit by the plastic covers, as damage and injury can occur. For more on protecting your floor and managing space, see our article on treadmill mats and flooring.
Maintenance and troubleshooting
Regular maintenance keeps a curved treadmill running smoothly. The AirRunner manual recommends wiping down all surfaces with a mild soap solution after each workout and drying them thoroughly. Perspiration is corrosive, and if allowed to remain on the machine it can cause discoloration, fading, rust, and odors. Do not use abrasive brushes or cloths, and do not flood any area with cleaning liquid.
On a monthly basis, the manual advises inspecting the unit for noisy, damaged, or loose components. Ensure the treadmill does not rock; if it does, readjust the leveling feet. Check the entire unit for loose hardware, including the uprights, handrail, frame, and plastic covers. Lubricate the twelve running belt guide pulleys with one drop of silicone-based lubricant per pulley. Move the treadmill and clean or vacuum any dust, lint, or debris found inside the belt and under the frame. The console will post a monthly service reminder icon when it is time to service the machine; once serviced, the icon can be reset in the settings mode.
The manual also includes a troubleshooting section. If the console will not power on, check the battery orientation or replace the four AA alkaline batteries. If the console powers on but metrics do not post, inspect the speed sensor cables for damage or disconnection, and adjust the speed sensor positioning if needed. If the running belt is difficult to move, an item may be wedged in the running belt path, or a support bearing or guide pulley may have seized. For squeaking or rubbing noises, the belt may need realignment or re-tensioning, or the twelve guide pulleys may need lubrication. The manual stresses that if you detect unusual noise, scraping, knocking, grinding, or vibration, you should discontinue use immediately and contact an authorized service technician. For more belt care steps, see our treadmill belt care page.
Activity guidance from health authorities
The Centers for Disease Control and Prevention (CDC) publishes physical activity guidelines that can help you decide how to use a curved treadmill as part of a healthy routine. According to the current Physical Activity Guidelines for Americans, adults need at least 150 minutes of moderate-intensity aerobic activity each week, or 75 minutes of vigorous-intensity activity, or an equivalent mix of the two. In addition, adults should do muscle-strengthening activities that work all major muscle groups on two or more days a week.
The CDC notes that you can spread activity throughout the week and break it into smaller chunks of time. For example, 30 minutes of brisk walking on a curved treadmill five days a week would meet the moderate-intensity recommendation. If you prefer more intense sessions, 75 minutes of vigorous running each week also meets the guideline. The CDC also states that some physical activity is better than none, and adults who sit less and do any amount of moderate- or vigorous-intensity activity gain some health benefits. Before starting any new exercise program, the AirRunner manual advises obtaining a thorough medical exam from your physician, especially if you have high blood pressure, high cholesterol, diabetes, a chronic respiratory illness, heart disease, are pregnant, have a family history of these conditions, are over age 45, smoke, are obese, have not exercised regularly in the past year, have other chronic illnesses or physical impairments, or are taking any medication. If you experience dizziness, chest pains, nausea, or any other abnormal symptoms while using the treadmill, stop immediately and consult a physician before continuing.
Frequently asked questions
Do curved treadmills need electricity?
No. The AirRunner manual specifies that the treadmill is non-motorized and the console runs on four AA alkaline batteries. The belt moves only when you walk or run on it, so no power cord or outlet is required for the belt to operate.
How do I stop a curved treadmill quickly?
Because there is no emergency stop button, you stop by reducing your pace and stepping onto the side rails once the belt has slowed. The AirRunner manual warns that the treadmill will slow to a stop on its own when you stop moving, but you should always stay in control and use the handrails for support if needed.
Can I use a curved treadmill if I have never run before?
Yes, but you should start slowly and consult a doctor if you have any health concerns. The CDC guidelines recommend that any amount of physical activity is beneficial, and you can begin with walking. The AirRunner manual states that the treadmill may be used for running or walking, and it should not be used without prior instruction by qualified personnel. Always follow the safety instructions in your owner’s manual.
For more detailed information on curved treadmill features, safety, and comparisons, visit our curved treadmills category page. You can also explore our treadmill types section to see how curved models differ from motorized treadmills and walking pads.
