Walking Pad:
SupeRun Under Desk Walking Pad
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I’m recommending the SupeRun Under Desk Walking Pad purely for its low price and relatively good lifespan. It's nearly always under $99 or less.
That being said, I also really like the size and ease of use. I move mine under my desk and back out several times a day.
If you walk 10-20k steps a day, this will last 3-6 months. If you walk less than that, it will last indefinitely.
I’d skip the wonky Chinese app.
Walking Pad w/ Handle:
Sperax Walking Treadmill, 3 in 1 Under Desk Treadmill
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Although clunkier than the SupeRun, the Sperax Walking Treadmill includes a handlebar for stability and therefore does not require a standing desk.
I’d skip the wonky Chinese app.