Emily ParkerBy Emily Parker

Updated November 2026

The costway 3.75hp folding treadmill is a motorized walking and running machine that folds upright to save floor space. This guide walks you through what the 3.75 HP rating actually means, how to check the specs against your needs, how to set the machine up and fold it safely, and what routine care keeps it running smoothly. By the end, you should be able to decide whether this model fits your space and your workouts.

What the 3.75 HP Rating Means on a Folding Treadmill

Horsepower on a treadmill is a continuous or peak motor rating, and manufacturers do not always state which. Peak horsepower is the number usually printed on a box, while continuous horsepower is the figure that tells you how the motor handles sustained use. For a home folding treadmill, a motor in this range is generally aimed at walking and light jogging rather than long, heavy running sessions. Read the product listing for whether the 3.75 HP figure is peak or continuous, because that changes how hard you can push the belt for extended periods.

Shopping for one? See our guide: 10 Best Folding Treadmills for Small Spaces Compared in 2026.

Motor size matters less than you might think for walkers. A person weighing around 200 pounds walking at a moderate pace places far less load on the motor than a 180-pound runner doing intervals at high speed. Match the machine to how you actually plan to use it.

Step 1: Check the Specs Against Your Workout

Before you commit, compare the listed specifications to the way you plan to train. Manufacturers specify the following categories, and each one affects daily use:

  • Maximum speed: Walking needs roughly 1 to 4 mph, brisk walking 3 to 4.5 mph, and jogging 4.5 to 6 mph. If you plan to run faster, confirm the top speed on the spec sheet.
  • Incline range: Many folding models offer manual incline in a few fixed levels. Check whether the incline is adjustable from the console or by a manual lever.
  • Running surface: Belt length and width determine stride comfort. Taller users usually want a longer belt, often 50 inches or more, to avoid stepping too close to the rear roller.
  • Weight capacity: Stay within the stated user weight limit. Exceeding it strains the motor and frame.
  • Folded dimensions: Measure the folded footprint and depth, plus the clearance you need behind the unit to pull it out.

Step 2: Measure the Space Before Delivery

Folding treadmills look compact in photos, but the real test is the room. Measure three things: the floor width and depth when the belt is unfolded, the folded height and depth, and the path from the door to the spot where the unit will stand. Doorways and hallways are where many people get stuck. Also allow a few inches on each side of the machine so you can reach the console and the emergency stop clip without bumping walls.

Measurement What to Record Why It Matters
Unfolded footprint Length and width of the open machine Confirms you have room to walk and stop safely
Folded footprint Depth and height when upright Shows how much floor space you recover
Doorway and hallway width Narrowest point on the delivery route Prevents delivery problems
Ceiling height Clearance above the console Matters for tall users and sloped ceilings
Rear clearance Space behind the unit Needed to pull out and unfold the deck

Step 3: Assemble the Costway 3.75HP Folding Treadmill Correctly

Most folding treadmills in this category arrive partly assembled, with the console, handrails and upright frame needing attachment. Follow the included manual and keep the hardware sorted in labeled bags. Work on a clear floor with enough space to lay the deck flat.

Assembly Checklist

  1. Lay out all parts and count the hardware against the parts list.
  2. Attach the console and handrails according to the diagram, hand-tightening bolts before using a wrench.
  3. Connect the console cable to the control board, making sure the plugs are fully seated and not bent.
  4. Tighten all bolts evenly, including the folding hinge and locking pins.
  5. Check that the belt is centered and tension it using the rear roller bolts if the manual calls for it.
  6. Plug the power cord into a grounded outlet, preferably on a dedicated circuit if your manual recommends it.

Tools You Will Need

Expect to need the Allen keys or wrenches supplied in the box, a Phillips screwdriver, and a tape measure for belt alignment. A second person is helpful for lifting the upright frame.

Step 4: Learn the Safe Folding and Unfolding Routine

Folding is where many accidents happen, so treat it as a deliberate motion. Keep the belt stopped, the power off or the safety key removed, and your hands clear of the hinge. Lift the deck by the handrail or frame at the designated point, not by the belt or the console. Engage the locking latch fully before letting go. When unfolding, release the latch and lower the deck slowly under control.

Always confirm the latch is fully engaged before walking away from a folded or unfolded treadmill. A partially engaged latch is the most common cause of unexpected drops.

If the deck feels heavy or the lock does not seat smoothly, stop and check the hinge and pins rather than forcing it. Consult the manufacturer or a qualified technician for persistent issues.

Step 5: Set Up Safety Features

Attach the safety key or clip to your clothing before starting. Stand on the side rails, not the moving belt, until you reach your starting speed. Begin at a low speed and increase gradually. Familiarize yourself with the emergency stop by pulling the key once while the machine is running at a low speed so you know how quickly it stops.

Step 6: Routine Care and Maintenance

Keep the belt clean and dust free. Check belt alignment every few weeks, since a belt that drifts toward one side can rub the frame. Lubricate the deck only if the manufacturer specifies a silicone-based treadmill lubricant, and follow the amount listed. Vacuum underneath the motor cover periodically, with the unit unplugged. Tighten loose bolts on the frame and handrails after the first few weeks of use, since parts can settle.

Common Mistakes

  • Buying by horsepower alone. The motor rating does not tell the whole story. Check belt size, incline, and weight capacity too.
  • Skipping the space measurement. Measure the doorway and rear clearance, not just the folded footprint.
  • Folding with the belt moving or the power on. Always stop the belt first.
  • Ignoring belt alignment. A misaligned belt wears faster and can damage the edges.
  • Starting at high speed. Ease into your workout to avoid stumbles.
  • Placing the unit on a soft or uneven surface. Use a flat, firm floor and keep the area behind the belt clear.

Tips for Getting the Most From a Folding Treadmill

  • Keep the console within easy reach so you can stop without stepping off the belt.
  • Use a floor mat if the unit sits on carpet, which helps stability and makes cleaning easier.
  • Track your speed and incline in a notebook if you want to see progress over weeks.
  • Store the safety key in the same place every time so you never have to search for it.

A few accessories make everyday use easier. A mat protects flooring and reduces noise, and a silicone treadmill lubricant is worth having if your manual calls for it. A heart rate monitor chest strap can help you judge intensity if the console display is limited.

  • Treadmill floor mat: Protects floors and dampens vibration. View on Amazon
  • Silicone treadmill lubricant: Use only the type your manual specifies. View on Amazon
  • Bluetooth heart rate chest strap: Gives a more accurate pulse reading than wrist sensors during walking. View on Amazon

FAQ

Is the costway 3.75hp folding treadmill suitable for running?

It can handle light to moderate running, but check the rated top speed and continuous horsepower. Heavy or long running sessions are better suited to a machine with a larger motor and heavier frame.

How much space do I need behind a folding treadmill?

Plan for enough room to pull the deck out and step onto the belt safely. Measure the manufacturer’s specified rear clearance and add extra space for comfort.

Do I need to bolt a folding treadmill to the floor?

Most home folding treadmills do not require anchoring. Stability comes from a level, firm floor and the folded latch being fully engaged. Check your manual for any specific instruction.

How often should I check belt alignment?

Check it every few weeks, and any time the belt looks to be drifting. Adjust gradually and recheck after each small turn of the adjustment bolt.

Can I fold the treadmill with someone standing on it?

No. Always clear the deck and stop the belt before folding.

What should I do if the treadmill stops unexpectedly?

Check that the safety key is seated, the power cord is secure, and the outlet is working. If the problem continues, stop using the machine and contact the manufacturer or a qualified repair technician.

Should I consult a professional before starting an exercise program?

Yes. If you have heart disease, joint problems, balance issues, or other health concerns, speak with a doctor or qualified fitness professional before beginning a new routine.

Conclusion

The costway 3.75hp folding treadmill suits people who want a compact machine for walking and light running. Start by checking the spec sheet against your workout, measuring your space and delivery route, and following the assembly and folding steps carefully. With routine belt checks and a cautious start, the machine can serve well for daily use.

Ready to choose one?

Emily Parker

About Emily Parker

Emily Parker is part of our editorial team and reviews and edits our treadmills & walking pads guides, checking product details against manufacturer specifications and owner feedback.