[Thank you in advance!]

Please feel free to tear it apart!
MGMAT Practice CAT Essay Question:
The following appeared in a print advertisement for a dietary supplement:
“According to a recent study, professional bodybuilders who used Train & Gain, a new protein supplement, over the course of three months experienced an increase in measured strength of up to 20%. Since Train & Gain is now available without prescription at all major pharmacies, superior results are no longer limited to professional athletes. Try Train & Gain today and you too can boost your strength and achieve professional-level performance in just a few months.”
Response:
The preceding advertisement seems to promise everyone's dream supplement, offering bodybuilder-muscles in a minuscule time frame. In the above statement the author argues that the dietary supplement "Train & Gain" will boost consumers' performance to a professional level in just a few months. Along with its qualities, the argument has a number of serious flaws that serve to weaken its cogency.
First, the argument relies heavily on the assumption that all body-types and exercise routines are created equal. This casts doubt on the validity of the author's conclusion that professional level results are achievable at all using this supplement, and even more so for the given time frame. The advertisement would be significantly more convincing and it would be much clearer that your average-Joe could achieve success with the product, if the author had provided evidence that more than just professional bodybuilders had successfully used "Train and Gain" to produce "professional level" results in the advertised time frame.
Furthermore, the argument begs the reader to ask if any nonprofessionals experienced similar results? Has there been any variance in the required time of use required for significant results? Without addressing these questions and the author's general lack of relevant information, the author leave the impression that the advertisement provides nothing more than wishful thinking.
In conclusion, the argument is weak and unconvincing because it fails to support its assumptions and claims with clear examples or evidence. Granted the author does address the question of accessibility to the general public, which is very helpful and relevant. However, without addressing the aforementioned questions and providing all the relevant information, the author pushes the reader to make a series of leaps of faith, leaving the argument unsubstantiated and ultimately unconvincing.