The best replacement for weights is cardio.

The best alternatives to weights are rated as following:
★★★★★  cardio
★★★★  machines
★★  cardio first
★★  bands
★★  resistance bands
★  calisthenics
★  bodyweight
★  weight machines
★  machine weights
★  light weights
★  yoga
★  reps
★  bowflex
★  bands for p90x
★  kettlebells
★  pilates
★  no weights
★  weighs
  pull ups
  push ups
  free weights
  machine
  running
  weights
  resistance
  cardio to lose weight
  trx
  heavy weights
  cardio in the morning
  weights before cardio
  weights then cardio
  aerobics
  bodyweight exercises
  machine exercise
  run first
  do cardio first
  resistance machines
  bodyweight training
  cardio first to lose weight
  machine training
  aerobic first
  standard weights
  dynamic tension
  more reps
  smith machine
  nautilus

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

Other search terms related to weights and their ratings are:
★★★★★ handles
★★★★ bench
★★★★ cardio
★★★ weights
★ bulking up
★ squats
★ gaining weight
★ dumbbells exercises
★ dumbbells
★ crunches
★ treadmill
★ gym
★ cardio workout
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You have in mind a companion for weights and it is not yet here? Propose!



Google Trends

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