Preheat the oven to 450 degrees and grease a large baking sheet. Punch the dough to deflate it, then turn out onto a lightly floured surface. (If the dough seems tight, cover and let rest until it relaxes.) Divide the dough into 6 pieces. Roll and stretch each piece with the palms of your hands into a 30-inch rope, holding the ends and slapping the middle of the rope on the counter as you stretch. Form each rope into a pretzel shape.
Dissolve the baking soda in 3 cups warm water in a shallow baking dish. Gently dip each pretzel in the soda solution, then arrange on the prepared baking sheet and sprinkle with the coarse salt. Bake until golden, 10 to 12 minutes.