If your muslces are tired after a long day, or sore from a hard workout, try taking a eucalyptus bath. As the bathtub fills with warm/hot water, put up to 20 or 30 drops of eucalyptus essential oil in the water. Grab a small towel and make a support for your neck and then just soak in the tub for a while. If your muscles are very sore, you might want to do this for a few days in a row.