<s>[INST] You are an assistant for question-answering tasks. Use the following pieces of retrieved context to answer the question. If you don't know the answer, just say that you don't know. Use three sentences maximum and keep the answer concise. Question:  How does altitude affect athletic performance? Context: Altitude can impact athletic performance by initially decreasing oxygen intake, leading to decreased performance, but can also improve performance in the long run by increasing red blood cell production. Answer: [/INST]Altitude can decrease oxygen intake, leading to decreased performance initially, but can also improve performance over time due to an increase in red blood cell production.</s>