When comparing Treadwater desk vs Kneeling Chair, the Slant community recommends Kneeling Chair for most people. In the question“What is the best working position when coding?” Kneeling Chair is ranked 3rd while Treadwater desk is ranked 6th. The most important reason people chose Kneeling Chair is:
Kneeling chairs reduce low back or neck pain for some people.
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Pros

Pro Prevents inactivity better than a treadmill
If you stop walking on a treadmill you either fall or trigger the off switch. With the treadwater desk, you drown.

Pro Epsom salts can be added
To help with arthritis, other health problems, and buoyancy.
Pro Can reduce lower back and neck pain
Kneeling chairs reduce low back or neck pain for some people.
Pro Varying leg positions can help restlessness when you need to keep sitting
You can use the chair with your shins on the shin pad, as intended, or use the shin pad as a foot rest for one or both feet. Being able to switch it up can be very helpful if you get restless sitting still very easily, but don't have the option to get up and move around.
Pro Good for forward-leaning tasks
Kneeling chairs make forward-reaching tasks easier.
Pro Encourages upright posture
Kneeling chairs position you with an open hip angle. This eases your hips forward to encourage an upright posture, aligning your back, shoulders and neck.
Cons
Con Not an actual product
The Treadwater desk is an idea mentioned in a parody blog.
Con Kneeling chairs can be tricky to get in and out of
They're not as intuitive as normal chairs.
Con Research on health benefits is mixed
While some studies have shown these style chairs to be good for maintaining posture, other studies have suggested they may be no better and possibly worse than a well-designed traditional chair. Prolonged usage of the shin pad with both knees (sitting as intended) may lead to decreased circulation to the lower legs.
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