Toss sliced strawberries with sugar in a microwave-safe bowl. Microwave for 1 to 2 minutes, stirring once or twice until berries soften slightly. Let cool for 5 minutes. Scoop 3/4 cup light vanilla or strawberry ice cream or frozen yogurt into each of 5 bowls. Top with strawberry sauce.
Stay lean: "Light" ice cream means the product contains no more than 225 calories and 6 grams of fat per 3/4 cup.