The best replacement for sitting is setting.

The best alternatives to sitting are rated as following:
★★★★★  setting
★★★  standing
★★★  standing at work
★★★  seating
★★  lying down
★  standing blood pressure
★  squatting
★  standing desk
★  standing military press
★  standing to wipe
★  standing bicep curls
★  boarding
★  siting
★  squatting toilet
★  sleeping
★  standing heart rate
★  laying down
  standing while eating
  standing desk calories
  laying
  crawling first
  standing shoulder press
  standing wiping
  standing ergonomics
  lying
  standing calories
  supine
  bending
  kneeling

Your alternative for sitting is not listed? Suggest!
Speaking about sitting, one probably shouldn't forget about sciatic pain.

Other search terms related to sitting and their ratings are:
★★★★★ sciatic pain
★★★★ hemorrhoid pain
You have in mind a companion for sitting and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of sitting in all years. Click on graph for more.
sitting
setting
standing