Reebok I Run 4.0 Treadmill Review

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If you’re looking for a new home treadmill, then the Reebok I Run 4.0 Treadmill might be the perfect machine for you.

Built from the ground up with home running in mind, the I Run 4.0 Treadmill aims to strike a balance between gym-level features, sturdy build quality and affordability, whilst ensuring it remains small enough to store away when not in use.

reebok i run 4.0 treadmill review

We’ve bought, tried and tested the I Run 4.0 over the last 8 weeks, thoroughly testing all of its features and pushing it to its limits to see how it performs.

So, does the Reebok I Run 4.0 Treadmill live up to the hype?

Reebok I Run 4.0 Treadmill Review

Out of stock on Amazon? Click here to view the treadmill on Argos

Upon arrival, we noted that the I Run 4.0 is a little bit smaller than most of Reebok’s other treadmills. It also weighs less too, at around 56kg. It still takes two people to lift it though, so be sure that you have an extra pair of hands upon delivery.

Out of the box, it’s quick and easy to set up, taking us around 10 minutes from unboxing to starting our first run. There’s no assembly required, just unpack, unfold and you’re good to go.

Whilst being lighter than some other Reebok treadmills, the I Run 4.0 still feels like a strong and capable machine. During the course of our review, it didn’t feel cheap or flimsy at all.

Let’s take a look at some of the key features of the Reebok I Run 4.0 and see how they performed.

Reebok I Run 4.0 Features

Running Belt

One of the key features of any treadmill is the running belt. It’s important to have a deck that’s large enough to accommodate runners of all heights, whilst remaining comfortable and supporting underfoot.

The I Run 4.0 does a pretty decent job with the running deck. It’s fairly wide, with similar dimensions to other treadmills in this price range (L125cm, W46cm).

reebok i run 4.0 folding

The Elastomer cushioning technology does a great job underfoot, providing a comfortable shock-absorbing running surface. With a lot of budget treadmills, you can struggle with fatigue in the feet from a lack of cushioning – the I Run 4.0 doesn’t have this issue. After 60+ minutes of running, we felt fresh and able to continue running.

Well done on the running surface, Reebok!


The 4 window LED display is bright and modern, and is built into the front of the running machine just below the tablet holder.

It provides feedback on a number of metrics including: Speed, distance, time, calories, pulse, body fat, and your total number of steps.

The body fat guide is a nice added touch – it utilises the integrated hand sensors as well as your gender, age, height and weight to determine your BMI. Whilst BMI isn’t a perfect measure of one’s fitness levels, it’s good to have a rough idea as you progress on your fitness journey.

reebok i run 4.0 display

A notable disadvantage of the Reebok I Run 4.0 Treadmill is the lack of BlueTooth. At this price, we would expect to see every treadmill have the ability to connect to your phone via BlueTooth so you can track your runs using a running app. It’s a shame that the I Run 4.0 doesn’t have this feature, but if you’re not too bothered about using an app to track your runs, then you won’t even notice.

Other than that, the display does a brilliant job of providing all the metrics you want to see whilst running.

Speed and incline

The Reebok I Run 4.0 has a maximum speed of 16kph (approx 10mph) which is powered via the 1.25 HP motor. The treadmill feels smooth and runs pretty silently when in use, so you don’t have to worry about waking up the family or neighbours during those early morning workouts.

reebok i run 4.0 incline

The treadmill doesn’t have any adjustable incline features which is a shame, but it does have a set incline of 4 degrees. This is barely noticeable, but it has been shown that a slight incline whilst walking and running is better for joint health.

Adjusting the speed is done via the buttons just below the display – we would have liked to have seen integrated handlebar controls at this price, but it looks like Reebok opted for a more sleek and simple design for this model. Not a huge issue, but something we thought was worth noting.


The Reebok I Run 4.0 really comes into its own here. The 12 programmes are easy to access, and offer a range of walking and running sessions designed to suit people of all abilities – from the simplest of walks to the most gruelling runs.

In addition to the 12 pre set programmes, you have a choice of 3 target workouts designed to focus on time, distance or calories burned. We love this feature, and found that we were pushing ourselves to hit that certain number of calories burned before ending our workout.

Features Breakdown

  • Compact treadmill
  • Max. speed 16 kmh
  • Maximum user weight – 120kg (18 st 13 lb)
  • 1.25hp motor
  • 12 preset running programs
  • Built-in 4 degree incline
  • Elastomer cushioning
  • Decent-sized running deck
  • 4 Window LED Console
  • Hand Pulse Sensors
  • Auto-Stop Safety
  • BMI measurement
  • Lubrication reminder after 300km
  • Easy folding/unfolding
  • Transport wheels for easy storage

Build Quality

As with every treadmill we review, we always test the build quality of the machines. Whilst having a lot of training programmes is all well and good, you’ll want to buy a machine that’s going to last.

So, how did the Reebok I Run 4.0 hold up in our testing?

The Frame

Straight out of the box, the frame felt solid and strong for the price. We were impressed by how light the 4.0 was in comparison to other treadmills in this price range (it’s still heavy, just not quite as heavy as some others). It also folds and unfolds smoothly and easily without any hassle.

reebok i run 4.0 frame

When in use, the machine remains sturdy and doesn’t rock/move around or rattle. There’s also very little noise too, thanks to the cushioning on the deck.

The Warranty

Reebok always provide great warranties, and it’s no different with this treadmill. It comes with a 10 year motor warranty as standard, so you’re covered if anything were to go wrong with the motor that wasn’t your fault. In addition, you get a 2 year parts and labour warranty.

If you ever need help and advice, Reebok has a UK helpline and online chat available should you need it.


If you’re in the market for a compact home treadmill that’s foldable, has a good number of features to keep you motivated, and is built by a reputable company with a great warranty, then we would recommend considering the 4.0.

Our only caveat to this would be that for a similar price, you can get your hands on the Reebok Jet 100 Treadmill, which we’ve tested and reviewed. It’s got more features than the I Run 4.0 and has a larger running surface – the only important difference is the max user weight (120kg on the I Run 4.0, 110kg on the Jet 100).

Click here to read our full review of the Reebok Jet 100 Treadmill.

Out of stock on Amazon? Click here to view the treadmill on Argos


Does the Reebok I run have an incline?

The I Run 4.0 does not have an adjustable electronic incline like some other models. However, it does have a set 4-degree incline, which is designed to be better on your joints for walking and running.

Are Irun treadmills any good?

Reebok I Run treadmills are some of the best low-to-mid range treadmills on the market. If you’re looking to get fit at home and you want a treadmill that’s built to last, whilst including a bunch of gym-quality features, then we highly recommend the I Run range of Reebok treadmills.

How long do Reebok treadmills last?

Reebok treadmills are built to last, and the 4.0 comes with a 10-year motor warranty and a 2-year parts and labour warranty as standard. So, if something were to go wrong with your treadmill, you’re covered.

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  1. Reebok Jet 100 Treadmill Review
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