10. Jump rope

Where It Was Sold: Toy Stores, Macy’s, Sears, Walmart; Manufacturer: Wham-O
Initial Cost: $1*
When the Hula-Hoop first came out decades ago, it was a hit with both youngsters and adults. Within five years of its patent, this swiveling toy became an instant hit. In the first four months of Hula-Hoops’ release, Wham-O sold 25 million units of the product.

Haul-Hoops ©GeorgeLouis/Pinterest
More than 100 million units have been sold in just two years. Australian gym lessons served as an inspiration for Wham-O, the firm that created the Hula-Hoop, since the kids worked out by twisting bamboo hoops around their waists.