The best replacement for workout is work out.

The best alternatives to workout are rated as following:
★★★★★  work out
★★  split routine
★★  p90x
★★  sleep
★  eat first
★  evening workout
★  split
★  diet
★  tan first
★  rest
★  breakfast first
★  cardio first
★  yoga first
★  px90
★  run first
★  post workout
★  isolation
★  nap
★  p90x workout
  split workout
  gym
  treadmill
  p90
  split routines
  split training
  full body
  diet more important
  yoga
  high intensity
  after
  pilates
  split body workout
  treadmill workout
  fat burning
  elliptical workout
  bikram yoga
  cardio
  eat breakfast first
  insanity
  low intensity workout
  workout then eat
  muscle groups
  gym workout
  split body

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

Other search terms related to workout and their ratings are:
★★★★★ weights
★★★ equipment
★★ dumbbells
★★ jackie
★ sore muscles
★ medicine ball
★ cardio
★ resistance bands
losing curves
going to the gym
creatine
You have in mind a companion for workout and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of workout in all years. Click on graph for more.
workout
work out
split routine