The best replacement for recumbent is upright.

The best alternatives to recumbent are rated as following:
★★★★★  upright
★★★★★  upright exercise bike
★★★  stationary bike
★★★  upright exercise bikes
★★  upright stationary bike
★★  upright bike
★★  stationary
★  road bike
★  upright bikes
★  upright bicycle
★  supine
★  spin bike
★  decubitus
★  upright stationary bikes
★  regular exercise bike
★  trike
★  upright bicycles
★  stationary bikes
★  standard exercise bike
  spinning bike
  semi recumbent
  traditional exercise bike
  regular exercise bikes
  upright exercise
  upright stationary
  upright cycle
  recumbent
  semi recumbent exercise bike

Your alternative for recumbent is not listed? Suggest!
Speaking about recumbent, one probably shouldn't forget about under seat steering.

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



Google Trends

Scale is based on the average worldwide traffic of recumbent in all years. Click on graph for more.
recumbent
upright
upright exercise bike