Horizon 7.4 AT Review

Horizon Fitness builds an impressive array of gym-quality fitness equipment, including two different lines of treadmills. The 7.4AT is the mid-range of their Studio Series machines designed with streaming classes in mind. Horizons Studio Series machines feature larger decks, more powerful motors, and longer warranties than the less expensive Go Series treadmills. The latest version of this popular model has a relatively modern interface but foregoes the touchscreen to keep the price down. It provides an excellent exercise quality suitable for any fitness level or training plan thanks to its robust tread surface, 12 mph top speed, .7% to 14.7% incline, and app integration. With a 2701 square inch footprint, the treadmill is large, bulky, and fairly expensive but delivers on performance and allows the user to use a wide array of fitness apps.

Since we first tested the 7.4 AT, Horizon has made a few changes that make this an even better machine. Software updates have fixed several bugs, sped up the responsiveness of the machine, and allowed it to connect seamlessly with apps like Zwift and Peloton. The running surface has been tuned to be more compliant, and there is a new belt using a compound that reduces wear and provides better grip.

Tested and Rated

Many of the reviews of this treadmill have been paid for by the manufacturer but not at GearLab. We lay down the credit card and buy all the equipment we test at retail, just like you would. What I really loved about the 7.4AT are the quick adjust scroll wheels that allow you to swipe your speed and incline adjustments. I loved how simply you could adjust this machine with little more than a gesture.

Performance Comparison

Exercise Quality

The Horizon 7.4 AT impressed me with its stability and power. Due in large part to its rapid response to input and its generous 60" deck surface. The speed and incline range are within expectations for a machine of this caliber, but its ergonomic and easy-to-use controls made it one of my favorites. The deck cushioning feels natural yet muted and, even at low speeds, provides a subtle cushion for my stride. I found this machine especially comfortable when running at an incline.

Horizon claims the 7.4 AT has a 60-inch long by 22-inch wide running surface, and my measurements confirm their accuracy. Even at a 12mph sprint, the deck never felt cramped, and I could stretch my stride pretty long for walking cooldowns. The deck features 3-Zone Variable Response Cushioning engineered to work like a running shoe. The elastomer-based system provides three distinct zones of cushioning: the landing zone, the transition zone, and the push-off zone. In the front, there are softer elastomers where your foot strikes the treadmill deck, transitioning to a moderate elastomer as you move through your stride, and firmer elastomers at the back in your push-off zone. Basically, these three zones should provide the proper level of support at each phase of your stride. In practice, this doesn't feel pronounced, but a subtle flex underfoot left me feeling (maybe) less fatigued. Other treadmills we've tested use similar elastomers to support their decks but typically with uniform firmness.

With a tested top speed of 12.2 mph, this model can satisfy users of almost any fitness level, from weekend warriors to serious runners training for distance events. I tested the 7.4 AT, which was fairly accurate in belt speed. Using a rolling measuring wheel, I performed several speed-accuracy tests with the belt running at six mph for one minute each time. In these tests, the machine produced an average measurement of 537 feet, about 9 feet proud of a perfect score. While this isn't a critical metric for most people, some other models tested were more than twice as accurate. In these tests, consistency is far more important than accuracy. It may be less important for casual fitness runners, but those training for speed events might appreciate more precision.

The deck's flattest setting is at .7%, approaching zero when compensating for deck flex and up to 14.7% at terminal height. Other models specifically designed for incline training offer significantly more adjustment range, but I found this range more than adequate for my spring training needs. What I found impresive about this treadmill is how fast it adjusts the incline, and that may be helpful for users wanting to transition rapidly in high-intensity training sessions. Adjusting the incline was also a nice way to change gate mechanics and activate other muscle groups.

Companion App/Connectivity

One of the things I liked most about the 7.4 AT was the ability to get on and go; there's no Wi-Fi connection to worry about, no class to sign into, and no bootup period. While fitness apps and classes provide a huge value for many users, it's nice to have a machine that isn't reliant upon them (and your internet connection) to provide a workout. That said, the machine isn't devoid of technology. The treadmill features advanced FTMS Bluetooth, which stands for Fitness Machine Service protocol, and allows the treadmill to communicate with enabled apps. Apps like Zwift and Peloton will pair directly to the treadmill using the Bluetooth FTMS, allowing data to flow seamlessly between machine and tablet. This feature was slow to connect, but a 2024 software update improved its performance. Most streaming workouts, like Apple Fitness + and Nike Run Club, do not require treadmill connectivity; you can use them as standalone workouts, which can still be quite enjoyable. Sadly, this treadmill is still not compatible with the iFit app.

Features

While not devoid of features, the Horizon 7.4AT is decidedly low on tech features. The machine provides an excellent workout but is not heavy on technological integration. Apps like Peloton, Zwift, and Nike Run Club work with the machine but won't adjust your speed or incline while running. The apps will prompt you to make adjustments and display your speed, incline, and heart rate in the app. The motor on this treadmill generates 3.5 CHP, which means constant horsepower; that's more than a treadmill generating 3.5HP. It accelerates quickly while raising and lowering faster than any other tested machine we've tested.

The console has two speakers, a small fan, quick access controls for incline and speed, and dual recesses for water bottles. Handlebars that uniquely turn upwards extend from the console's center with Quick Dial controls that I found exceptionally user-friendly. The right dial rolls forward to increase speed and back to decrease speed, and the left rolls forward to increase the incline and back to decrease the incline. This feature makes adjustments intuitive and prevents you from having to push buttons repeatedly. Additionally, the handlebar has contacts that measure your pulse with just a light grip. Tablets can be stowed high in line with your gaze or lower over the 8.25" LED screen. When using an integrated app, all of the info on the treadmill's display will show up in the app, so covering it doesn't deprive you of any pertinent information. The remainder of the console is smooth and easy to wipe down post-workout.

Built-in Bluetooth is useful for connecting to the included heart rate strap or playing music through the speakers. If Bluetooth isn't your thing, a 3.5mm cable is included to plug in other audio playback devices. The sound quality isn't fantastic, but it's what I've come to expect from a treadmill console. If you're a stickler for good sound quality, you can find the best wireless headphones/earbuds here. There is also a USB-A jack that provides power for your phone or tablet while you stride.

Ease of assembly

For starters, this treadmill will appear in a semi-truck with a liftgate; it's moved via pallet jack but barely. The size of the 386 lb box is intimidating and a struggle for even the experienced trucker delivering it. This is a treadmill that you will want to set up once in a permanent location that is at least mostly dedicated to its 73 x 37" footprint.

The assembly of this treadmill took me 81 minutes, and while not incredibly arduous, it requires pulling cables and connections through the support struts and some fancy finger work so as not to pinch those cables. Every piece of this treadmill is heavy, translating to a solid, commercial-feeling workout experience, but assembly isn't easy. There were several steps that the factory could have taken to make final assembly easier; that said, it's an incentive to only assemble this treadmill once in its final location.

Storability

This treadmill features a pneumatic assist to help it fold. While its footprint gets smaller, you don't realistically gain much space. The 73" long footprint is reduced to 45" due to the deck's overhang while its actual footprint on the floor is 33". While it's not the largest of the folded treadmills we've tested, its 69" folded height is imposing in most spaces. The bottom of the treadmill features two wheels that, while not easy to utilize, make moving the treadmill on a hard surface possible. Unlike other treadmills we've tested, the entire treadmill rocks back onto two centrally located wheels, allowing you to move it like a dolly.

Noise

One of the metrics we test and analyze is the noise each treadmill produces. To capture and compare the amount of noise, we measured the decibel output of each machine at several different settings from a fixed distance. At one mph, the 7.4 AT makes 45 dB without a user on its track and 49 dB with a walker. At four mph, 57 dB, and 61.4 dB with a jogger on the belt. Sped up to 7.5 mph, the machine makes 64 dB, and with a runner, it registers 67 dB. The Horizon is 1.4 dB louder than the Echelon Stride 6 at four mph; while not a huge difference, it may be the difference between waking up the baby or disturbing a neighbor.

Comparing the sound from the treadmill with and without a runner, you can see that most of the sound produced is from the machine itself, not the runner's footfalls. There are shoes with softer soles that can dampen the noise a bit, but if a quiet workout is you thing, picking the proper treadmill is imperative.

Should You Buy the Horizon 7.4 AT?

Those wanting to commit seriously to indoor running instead of an app with a monthly fee should consider this machine at the top of their list. This treadmill provides a solid workout experience, nice ergonomics, and the ability to bring your entertainment to the console. If this treadmill fits your budget and you have the space, I wholeheartedly recommend it.

What Other Treadmills Should You Consider?