A.I. Explanation:

Option 1: "The heated system of the sauna such as FitBomb is not proven and accepted by the FDA."

Explanation: This option is incorrect because it contradicts the text, which states that the heated system of the sauna is proven and accepted by the FDA for its effectiveness in relieving pain and muscle soreness. The use of 'not proven' directly opposes the information provided in the text.

Option 2: "FitBomb can promote greater strength and fitness by encouraging the release of human growth hormones and a muscle-building."

Explanation: This option is correct as it accurately summarizes a key point from the text. It highlights how the FitBomb sauna promotes greater strength and fitness through the release of human growth hormones and muscle-building proteins. This aligns with the main idea presented in the text regarding the benefits of using the FitBomb sauna.

Option 3: "It's only about the benefits that one can have from being in a sauna for as long as possible and the different ill-effects that one can face."

Explanation: This option is incorrect because it misrepresents the content of the text. The text focuses on the benefits of the far infrared sauna, specifically the FitBomb, and does not discuss ill-effects or the duration of sauna use. Therefore, it provides partial information that does not accurately summarize the text.

Option 4: "The benefits of the special kind of sauna and how the FitBomb has been one of its kind and promoted greater strength and fitness."

Explanation: This option is incorrect as it is too vague and does not capture the specific details mentioned in the text. While it mentions benefits and the FitBomb, it lacks the precise information about the mechanisms (like the release of human growth hormones) that contribute to strength and fitness, making it an incomplete summary.