Fill a small bucket or foot spa with warm water. Add 4 to 6 tablespoons of Epsom salt and stir until it starts to dissolve. Soak your feet in the water to relax tired muscles and reduce soreness. Gently rub your feet over the salt grains for exfoliation and improved circulation. Continue soaking until the water cools. If you wish to extend your soak, add some more warm water and mix well before continuing.