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It's always easier to slouch, so if you want a better back the Wigli Stool is the way to go.

The Wigli Stool isn't one of those ergonomic seats designed for absolute comfort, the seat was designed to make you work for the proper posture. The Wigli Stool is positioned at a tilted angle that forces you to steady yourself with muscles from the lower back and abdomen which strengthens your core and prevents back pain. It may look uncomfortable, but no pain, no gain.