Choosing a weakness or growth opportunity that you'd like to focus on and where you'd like to sharpen your skills advertises your strengths. Exhibiting this focus and determination to improve says a lot about your character and drive. Even better if you have a clear understanding of how the program at Yale University School Of Medicine can help you get there. At the same time, use discretion. Best not demonstrate a weakness that's a core skill for your success as a med student. Recognizing that you aren't great at something and acknowledging you need to improve showcase that you have a clear action plan for your development. Soft or hard skills can both be appropriate here.