The best replacement for cardio is weight training.

The best alternatives to cardio are rated as following:
★★★★★  weight training
★★★★  weights
★★★  fat burn
★★★  weight lifting
★★  strength training
★★  weights first
★  aerobic
★  fat burning
★  strength
★  lifting
★  weight training for weight loss
★  lifting first
★  strength first
★  hiit
★  weights for weight loss
  yoga
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  strength training first
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  conditioning
  diet
  no cardio
  weight training first
  pilates
  weights in the morning
  weight
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  abs first
  weight lifting first
  weight loss
  yoga first
  strength for weight loss
  lifting weights
  resistance training
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  interval training
  fat burn workout
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  weight first
  circuit training
  aerobic exercise
  resistance
  crossfit
  strength training for fat loss
  weight lifting for weight loss
  weightlifting
  low intensity cardio
  fat burning workout
  lift weights first

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

Other search terms related to cardio and their ratings are:
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★★★ losing muscle
★★ weight training
★★ weight lifting
★ losing mass
★ strength training
★ muscle loss
★ losing weight
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You have in mind a companion for cardio and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of cardio in all years. Click on graph for more.
cardio
weight training
weights