A 6-year-old boy presents with polyarthritis. His parents report no past medical history except for a sore throat 6 weeks previously. On physical examination, a murmur is noted. The assessment data support a diagnosis of:.A. Acute rheumatic fever. B. Rheumatoid arthritis. C. Lyme disease. D. Reiter syndrome.

People who utilizes the progression principle will ensure their exercise program increases in frequency, intensity, time, and type. the changes need to happen gradually in order to ensure they make gains in their fitness program. a person who doesn't utilize the progression principle can still gain health benefits from exercising, but will not continue to improve in cardiovascular fitness.