Dumbbells Under 20lbs For Under $20
Dumbbells Under $20 For When You Want to Work Out Without Cashing Out
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Here's that multipurpose option. Try using the Mira 17oz Insulated Water Bottle ($14) as an adjustable weight. Just fill the bottle until you have your desired weight, then drink the water post-workout. If you'd like to try a different type of water bottle, check out these editor favourites.