Cross-country skiing is one of the most grueling winter sports there is: competitors have to push their bodies to the limit to get across the snowy finish line. Nobody pushes harder than Jessie Diggins, who is regarded as the greatest American winter endurance athlete ever; she's certainly the most decorated, with four Olympic medals to her name. Her story is captured in the new documentary Threshold, and Collider is proud to exclusively present a sneak peek from the film before its digital release on August 28.
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