WalkingPad X21 Review: Is the Double-Fold Treadmill Worth It?

WalkingPad's dedicated X21 technical specification page currently lists 240 lb.

Some other WalkingPad comparison/collection material may show 242 lb.

Walking Counts uses the dedicated X21 technical specification of 240 lb. Verify the current listing and documentation for the exact unit you buy.

Similarly, the spec table lists an 81-lb net weight while one answer in the same page's FAQ says 84 lb. We use the 81-lb technical figure.

WalkingPad says the X21 folds "in two simple moves" to reduce its storage footprint compared with its fully opened upright configuration.

Folding shortens it from 55.8 in to 39.6 in and brings the height down from 41.4 in to 8.8 in; the 27.9-in width stays the same. That's fundamentally different from the low-profile folding decks of the C2, Z1 and A1 Pro, which fold to about 5–5.4 in thick.

WalkingPad's X21 page says it can be stored flat or stood vertically against a wall or in a corner, and mentions built-in transport wheels. The folded unit is still substantial, so measure your available storage space first — we can't guarantee it fits a particular closet, wall or piece of furniture.

Despite the WalkingPad name, the X21 is closer in use to a compact conventional treadmill.

Walking pads vary, so not every model fits that description exactly. See walking pad vs treadmill.

Minimum 1 mph, maximum 7.5 mph.

The X21's published maximum is substantially higher than WalkingPad's walking-focused models. That's a ceiling, not a recommendation — the right pace depends on the person.

WalkingPad specifies a 7.5-mph maximum and describes the X21 as a treadmill that supports walking and jogging, rather than merely an under-desk walking machine. Its 47.6 × 18.1-inch running area is also wider than the walking surfaces of the C2, Z1 and A1 Pro.

Whether its dimensions and speed suit a particular person's running style, stride or training needs depends on that person.

The X21 has the widest published running area among these four models. Width alone doesn't make it comfortable for every runner, but it's a meaningful difference on paper.

The X21 is 30 lb heavier than the Z1, 26 lb heavier than the C2 and 18 lb heavier than the A1 Pro. That higher machine weight is one of the practical differences between it and WalkingPad's under-desk-focused models. WalkingPad's page confirms built-in transport wheels for rolling it between rooms.

SpeedDial is the X21's physical speed-control knob. WalkingPad says a quick twist jumps speed by 3 mph, while turning it gently fine-tunes it in 0.1-mph steps.

The current X21 specifications list "Remote Controller: No", so there's no conventional handheld remote. Speed can also be adjusted through the KS Fit app.

Yes, according to current manufacturer information. WalkingPad's X21 page says it syncs workout data for AI-powered insights and supports Apple Watch heart-rate tracking via the KS Fit app on an iPhone. App features can vary by model and version.

These models target substantially different uses. Read our full WalkingPad Z1 review.

The X21 isn't the conventional choice for under-desk walking, because it uses an upright treadmill frame and control structure. If desk walking is your main goal, WalkingPad's C2, Z1 or A1 Pro formats are the more usual fit. See our best under-desk walking pads.

Walking Counts reviewed current manufacturer-published information: speed, running area, capacity, motor, machine weight, unfolded and folded dimensions, frame, controls, app compatibility, folding mechanism and intended use.

This is a research-based review. Walking Counts has not claimed hands-on testing of the WalkingPad X21.

Read more about how we review products.