This will help diminish horizontal wrinkles across the forehead and release tension.Concentrate on your forehead and imagine its a smooth piece of glass. Visualization is a very important aspect in yoga, believed to help you achieve the desired effects.Place the tops of the fingers of each hand vertically in the center of your forehead.Applying a slight pressure, close your eyes and slowly slide the fingers out towards the hairline in a smoothing motion. Relax.Repeat twice to complete a repetition. Do a total of 3 repetitions.