That research led Dr. Bui to create this five-in-one foot trainer. It can be used to strengthen foot muscles, improve calf flexibility, massage feet, and stretch the plantar fascia ligament. It’s useful for athletes or those who need relief from high-heeled shoes or active lifestyles. Dr. Bui provides exercises to help get you started. All stretched out? The soapstone massager delivers hot or cold therapy to reduce inflammation and provide soothing relief.