Ask HN: What work/office purchase transformed your life?

For me, it was purchasing a stressless recliner as my primary "office chair". I had tried a standing desk, kneeling chair, herman miller aeron, and many others. But I always ended up with various parts of my body hurting or tightening up, for example, my hips felt tight on the aeron due to my shorter stature. Switching to a stressless recliner, my body is way more relaxed now and easily productive for hours.