Select a large mixing bowl in which to add the 1 cup of warm water, 1 Tablespoon of sugar, and the yeast.
The water should be 105-115ºF in order for the yeast to activate. You may heat the water over medium heat on the stove, and check it with an instant-read thermometer. If you don't have a thermometer, simply heat the water until it is warm to the touch, but of course, not hot enough to scald.
Pour the water into the bowl, sprinkle the sugar into the water, and then sprinkle the yeast over the water as well. Allow the mixture to sit for about 5 minutes, or until the mixture becomes foamy.