The best replacement for working out is diet.

The best alternatives to working out are rated as following:
★★★★★  diet
★★★★★  dieting
★★★  not working out
★★  liposuction
★★  eating
★  sleep
★  sleeping
★  training
★  eating less
★  working out
★  after
★  eating right
★  eating healthy
  weight loss
  plastic surgery
  after working out

Your alternative for working out is not listed? Suggest!
Speaking about working out, one probably shouldn't forget about sore muscles.

Other search terms related to working out and their ratings are:

★★★★★ sore muscles
★★★★ supplements
★★ dieting
★★ protein
losing weight
protein shakes
You have in mind a companion for working out and it is not yet here? Propose!

Google Trends

Scale is based on the average worldwide traffic of working out in all years. Click on graph for more.
working out