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ProForm 520 ZN Review

Quick Summary

The $599 ProForm 520 ZN Treadmill is a light duty treadmill for walkers.

Previous versions of this foldable treadmill had very substandard parts, but the newest model has significant upgrades such as better cushioning and a larger track.

Its new warranty reflects the improvements.

Learn about this ProForm’s pros and cons from the complete 520 ZN Treadmill review below.


Model ProForm 520 ZN

Our custom rating considers all of the treadmill's features, specs, warranties, and 100's of user & expert reviews, to save you time!

List Price

Suggested retail price, typically higher than the price you'll pay with our recommended retailers.

Best Price

Since prices change daily, this link goes to our preferred retailer for the current best price. Note: MSRP stands for Manufacturer's Suggested Retail Price.


Treadmill Speed is measured in Miles Per Hour (mph). Average running speed is 5-9 mph.

0 - 10 mph

Treadmill Incline measures the angle of the deck, and how steep it is relative to the floor (0% is flat, and 15% is like a steep hill).

0 - 10%

The Treadmill Motor is what turns the belt as you run. We recommend at least 2 HP (Horsepower) motors, 2.5+ HP for jogging, and 3.0+ HP for running.

2.5 CHP

Treadmill Deck dimensions are measured in inches: Width x Length. The wider and longer the deck, the safer it is (55-60 inches long recommended for running).

20" x 55"

The Treadmill Belt is the surface you run on. The thicker the belt, the less impact on your joints. At least 2-ply (1 inch) recommended.

ProShox™ Cushioning

Some treadmills are designed to conserve space by folding up. This is a convenient option, but some features might be reduced.


Treadmill Programs allow you to complete a workout with changing speeds and inclines, without changing anything manually.

Max. Weight

Treadmill Max User Weight is the amount of weight, in pounds (lbs), that it can safely support, which can represent durability.

300 lbs
Heart Rate

Heart Rate programs allow you to track how many times your heart is beating per minute (bpm), and some control the workout for you.

Dual-Grip EKG Monitor

Dimensions are included to help you figure out if this treadmill will fit properly (Length x Width x Height and Height x Depth).

73" x 33" x 57"

Treadmill Display refers to the screen you'll look at to monitor workouts. LED and LCD displays are similar to TV screens.

6" Backlit LCD
Cooling Fans

Treadmill Cooling Fans are designed to help keep you cool during an intense workout.

Accessory Tray

Some treadmills include an accessory tray for holding items such as water bottles, wallets, keys, or MP3 players like iPods.


Treadmills that include a sound system allow you to listen to your MP3 player/iPod through built-in speakers (no headphones).

Quick Controls

Quick Controls allow you to select speed, incline and even workout programs with the touch of a button (usually on the handles).


The warranty is a very important part of your investment. The longer the warranty, the longer you can get free/discounted repairs by the manufacturer.

Frame: Lifetime
Motor: 25 Years
Parts: 1 Year
Labor: 1 Year

Rating: 72.7%

Our Rating

Rating: 72.7/100. The ProForm 520 ZN is an entry level treadmill built for walking rather than running. Overall it can be a useful exercise solution on rainy days or when you can’t get to the gym. If regularly used several times per week though, it could have a pretty short life expectancy. Specs include a 55″ track with power incline, a 2.5 CHP motor, built-in training programs and iFit compatibility. This treadmill has a one-year parts and labor warranty.


  • Easily folds for storage
  • Standard track size for walking (55″ x 20″)
  • Power incline (10% maximum)
  • iPod-compatible (2″ speakers)
  • 18 workout apps
  • Backlit data display
  • iFit-compatible (Monitor sold separately)
  • Contact pulse monitor
  • Tablet computer holder
  • Cooling fan
  • SpaceSaver (Foldable)


  • Noisy track
  • Not very durable
  • Calorie feedback isn’t customized (You can’t specify your weight)
  • No wireless heart rate monitoring
  • Slow customer service
  • Short warranty

An alternative we recommend at the $599 price point is the iFit-enabled ProForm 400i. With an iFit-enabled treadmill, there’s no need to purchase an iFit monitor. The 400i also has a more useful setup for data feedback.


The ProForm 520 ZN is designed for affordable and enjoyable exercise. Designed for walkers, it has a 55″ track and lets you boost your calorie burn with incline training. Other features include built-in workouts, iPod compatibility, a tablet computer holder and wiring for an iFit monitor.

The 520 ZN sells for $599 including delivery and a one-year warranty for parts and labor.

Workout Programs

Lots of workout guidance is included with this low-priced treadmill: The 520 ZN has 18 workout programs designed by a certified personal trainer. These are grouped into four categories – calories, intensity, incline and speed – and each program can control the treadmill’s speed and incline.

For infinite options you can add an iFit monitor. With an iFit membership you can download a new and customized workout every day, watch high definition video workouts, and virtually experience actual routes worldwide with Google Maps™.

The Google Maps™ option lets you choose from popular routes or download any path you please. The ProForm 520 ZN Treadmill will adjust its 0% – 10% incline to copy the landscape!

The iFit monitor will display an interactive Google Street View.

ProForm 520 ZN Features

Exercise data are shown on a basic LED with backlighting. The feedback include speed, time, distance, pulse and an estimate of calories burned.

For enhanced workouts the 520 ZN has an automated 10% incline. By using the maximum setting you can roughly double your usual calorie burn rate while maintaining your usual walking speed.

The tread track is the standard size used on walkers’ treadmills (55″ x 20″). It’s supported by the same ProShox™ cushioning that’s featured on more expensive ProForm treadmills.

For audio entertainment an iPod-compatible port and 2″ speakers are built into the console. The ProForm 520 ZN also has a holder for your tablet computer.

For easy storage this SpaceSaver treadmill is built with EasyLift™ Assist. Just push on the deck and shock-assist technology will fold it upward to reveal floor space.

Warranty & Guarantee

The ProForm 520 ZN Treadmill warranty includes:

– Frame: Lifetime
– Deck: Lifetime
– Motor: 25 years
– Parts: 1 Year
– Labor: 1 year

ProForm provides a 30-day money back guarantee on its treadmills.


The newest 520 ZN is one of ProForm’s most inexpensive treadmills. It’s a big improvement over its predecessor, but among $599 treadmills we prefer the ProForm 400i for its Watts LED console and iFit-enabled status.

If you can afford to spend more than $599, you’ll enjoy a big boost in treadmill capability and durability. See some our favorite treadmills under $1000.