I completely agree with this notion and will make the case for it by analyzing the benefits that physical training classes bring to youngsters.
In sentence 1 we must use the definite article because everyone knows which benefits phys-ed classes bring to youngsters, it's just a common sense.
Finally, the governmental financial reward for the organizations that have incorporated kitchens and gyms into their office spaces would be another effective (sound) countermeasure against the deterioration of public health.
Here we must not use the definite article because there are a lot of such organizations, and it's impossible to say which exactly the author means.
Am I right?