Final answer:
Every individual with pre-existing health conditions or over 40 years of age, particularly those with diabetes, asthma or a history of heart disease, should consult a doctor before beginning a new exercise program. In John's case, due to his age and condition, a routine medical examination is imperative before he initiates his fitness program.
Step-by-step explanation:
John should indeed consult a healthcare professional before commencing any form of new exercise program in all the situations mentioned, namely: a) if he is inactive and over 40 years of age, b) if he has diabetes or asthma, and c) if he has a history of heart disease
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As a 65-year-old with type 2 diabetes and asthma, his advanced age and medical conditions put him at a higher risk during physical exertion. It's always prudent to engage a medical authority who could prescribe an exercise routine that is suitable for his health condition and age, thereby minimizing potential risks. Doctors can also monitor any changes in health as he embarks on this new regime.
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