The best replacement for rowing is running.

The best alternatives to rowing are rated as following:
★★★★★  running
★★★  crew
★★★  cycling
★★★  sculling
★★  swimming
★★  spinning
★  jogging
★  kayaking
★  paddling
★  running burn more calories
★  jump rope
  biking
  cross country skiing
  cycling better
  sculling difference
  running calories
  running better
  running crossfit
  rugby
  canoeing
  sculls
  kayaking faster

Your alternative for rowing is not listed? Suggest!
Speaking about rowing, one probably shouldn't forget about bowflex.

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



Google Trends

Scale is based on the average worldwide traffic of rowing in all years. Click on graph for more.
rowing
running
crew