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In page Physical therapy:

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The body of knowledge of physical therapy is large, and therefore physical therapists may specialize in a specific clinical area. While there are many different types of physical therapy, the American Board of Physical Therapy Specialties lists ten current specialist certifications. Most Physical Therapists practicing in a specialty will have undergone further training, such as an accredited residency program, although individuals are currently able to sit for their specialist examination after 2,000 hours of focused practice in their respective specialty population, in addition to requirements set by each respective specialty board.[citation needed]