Once upon a time before the pandemic, Atlanta Braves fans cheered on “The Freeze” sprinter as he raced challengers between innings. The person inside of the costume, Durran Dunn, has now opened a gym in Cobb County despite the pandemic.

"The Freeze" is a welcome diversion at sweltering Atlanta Braves games. Wearing a full body leotard, the sprinting mascot races fans between innings of...