LifeSpan Fitness TX6 Under Desk Treadmill Ultra Quiet Walking Pad Treadmill at Home Office, 0.4 to 6mph, 400lbs Capacity (Black)

Why it's worth it

The TX6 has a 4.5 HP motor, a 400-pound capacity, and a 27.6-inch-wide deck — the most headroom of anything here. It's the one to buy if you plan to walk four or more hours a day, or if lighter pads have felt flimsy.

If you weigh more than 250 pounds, this is the only machine on this list we'd point you toward. The 400-pound capacity isn't marketing padding — it's the difference between a machine that lasts and one that starts throwing error codes at month thirteen. Buy a walking pad with a 220-pound ceiling when you weigh 240, and you're running the motor at its limit every single day. The TX6 gives you room to spare.

Consumer Reports found that treadmills with continuous-duty motors rated above 2.0 HP showed roughly 40% less performance degradation after 500 hours of use than motors rated below 1.5 HP. Five hundred hours sounds like a lot. At four hours a day, you're there in about six months. That's the argument for a bigger motor in one sentence: it's not about speed, it's about whether the thing survives your second year.

From our review of 7 under-desk treadmills, by Eleanor Vance, Health & Beauty Editor

What we like

• +If you weigh more than 250 pounds, this is the only machine on this list we'd point you toward
• +Consumer Reports found that treadmills with continuous-duty motors rated above 2.0 HP showed roughly 40% less performance…
• +The deck is the widest here at 27.6 inches overall and 60 inches long, which gives you a more natural stride than the narrow pads
• +LifeSpan is a commercial fitness brand, and the TX6 reflects that in the boring ways that count — a metal frame, a serviceable…

What to know

• –At 88 pounds and six inches tall, this is not a fold-and-stash machine
• –Some owners have flagged design annoyances out of the box — wheel and switch placement that makes moving and plugging in more…
• –Feedback on this specific model is thin compared with the volume behind the WalkingPad and Kassadin listings, so there's less…