The best replacement for lunges is squats.

The best alternatives to lunges are rated as following:
★★★★★  squats
★★★★  step ups
★★★  leg press
★★  split squats
★★  reverse lunges
★★  front squats
★★  walking lunges
★  hack squats
★  squats better
★  leg extensions
★  one legged squats
★  deadlifts
★  bulgarian split squat
★  forward lunges
  stiff leg deadlift
  stationary lunges
  leg curls
  leg extension
  pistol squats
  squats bodybuilding
  standing lunges
  dumbbell lunges
  squats exercise
  extensions
  diagonal lunges
  squat
  lunges
  land lunges
  regular lunges

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

Other search terms related to lunges and their ratings are:
★★★★★ knee pain
hammer curl
You have in mind a companion for lunges and it is not yet here? Propose!



Google Trends

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lunges
squats
step ups