The Elgin Archxerciser : Professional is designed as a powerful exercise tool for athletes looking to increase their abilities, or for any person who wants to strengthen their feet as a preventative measure to prevent sore feet. This professional strength foot exerciser strengthens the intrinsic and extrinsic musculature in the foot, helping in the treatment of a variety of common foot ailments including plantar fasciitis and heel spur syndrome. The Elgin Archxerciser : Professional provides a strong spring-load resistance for key foot exercises. This advanced model for athletes increases muscle strength in the arch, toes, and overall foot, helping improve running and jumping performance. This tool has a wide range of applications and has been scientifically proven to improve an athlete's jumping performance and acts as a preventative aid against sore feet for those who stand for extended periods. The spring provides strong resistance for strengthening the musculature in the foot. This small, compact foot exercise tool can be used at home, in the gym, or on the go. The professional model offers stronger resistance than the original standard model for extensively exercising the foot and arch, and was designed specifically with elite athletes in mind. A summary of a study using the Archxerciser reported that "The Archxerciser was utilized in 47 patients as adjunctive therapy in the management of common foot complaints and concerns. Three patients (6%) withdrew from the study due to exacerbation of symptomatology with the exerciser. Of the remaining patients in the study, 85% demonstrated marked reduction in symptomatology utilizing the Archxerciser. 15% of the patients completing the study did not feel the Archxerciser contributed to the reduction of their symptoms. All patients completing the study demonstrated increased extrinsic and intrinsic muscle strength to the foot utilizing the Archxerciser. The measured increase in strength ranged from 38% to 250%." The Elgin Archxerciser : Professional is an effective low-impact, repetitive, resistance exercise tool that engages the foot and arch to increase strength and help prevent possible future injuries. Elgin Archxerciser : Professional Specifications: Color: Blue. Measures: 11 inches long, 3 inches wide, 2 inches high. Model: Pro 005-FED2. Made in: USA.