Slice, simmer in boiling water for a good half hour. Strain and add to warm bath water. For an aroma therapeutic bath, keep tub water tepid. Hot water will cause those volatile oils to evaporate far too quickly. Do exercise in a warm bathtub.
Experts say there is definite additional benefit from exercise done under warm water.
Dry armpits thoroughly before applying deodorant as wet skin gives rise to bacteria. Shake vigorously and pour into your bath water. The shampoo will break the oil into millions of fine oil globules that cling to your zillions of open pores as you leave your bath. This is excellent for dry skin. Oil your body before you go for your bath, as then scrubbing with soap will take away more dead skin than normally.