Exercise balls

https://cashwalklabs.moneple.com/fitness_equipment_reviews/3210203
  1. I can sit on the ball while I am exercising.
  2. It doesn't cost very much to purchase.
  3. I can take this outside and use it to exercise.
  4. It is very lightweight.
  5. It can be deflated for easy transport.
  6. I can manipulate different muscles with the ball. 
  7. Exercise balls
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