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On Thursday, Heidi Klum, “Project Runway” host and supermodel launched “Heidi Klum for New Balance” in New York City.

The activewear collection, available only on Amazon.com, also turned out to be the focus of Thursday night’s “Project Runway” challenge, which clearly was…well, challenging.

“When I gave the Project Runway designers the opportunity to create a look for my collection, they thought it would be easy but soon realized how hard it is!” said Heidi.

The collection retails at price points between $32 to $168 and includes tunics, knits, woven tops, leggings and outerwear pieces. Click the thumbnail to browse the collection.