Young Athletes Foundation Winter Challenge is Open Now Grandma’s Marathon and their Young Athletes Foundation announced the start of the 'YAF Winter Challenge.' The program is free and will serve as a replacement for the 'Saturday Morning at the Races' events which have been cancelled for 2021. The 'YAF Winter Challenge' aims to help keep kids active during the pandemic. The Young Athletes Foundation has teamed up with Minnesota Duluth (UMD), St. Scholastica, and UW-Superior for the challenge in which each school will be featured for two-weeks between mid-January and late-February, each with a unique mix of challenges for the kids.