Final answer:
The exact percentage of new exercisers dropping out within the first 6 months or year is not provided in the references. Research typically shows high dropout rates within the first six months, but specific data would be necessary to provide a precise answer.
Step-by-step explanation:
The percentage of new exercisers who drop out within the first 6 months or the first year is not directly provided in the reference information given. The information addresses different aspects of workout programs, participation rates, and the nature of exercise variability. To provide an answer to this question, one would typically refer to published studies on exercise adherence, which suggest that a significant portion of those who begin an exercise program drop out within the early stages. General research indicates that dropout rates can be as high as 50% within the first six months, but these rates can vary widely depending on the program and individual motivation.
To accurately answer the student's question, additional specific research or data on dropout rates for new exercisers would be needed. The reference provided focuses on exercise duration, the variability in weight loss outcomes, probability distributions for years of studying ballet, walking rates in a city, weekly usage of an exercise facility, participation in after-school sports, health-related questions, and data concerning injuries and deaths related to running over the age of 50.