When answering this question, you want to present yourself as balanced and emotionally mature. Also, avoid spelling out any conflicts your pastimes would offer. You don't want them to think you're primarily interested in the party nightlife, as this will be a blatant conflict. Instead, aim to present your hobbies as a way of striking a balance between your professional pursuits and your time. Suggest they are a means of staving off burnout and making your studies more sustainable. Wellness, nutrition, and an active lifestyle are all highly valued and emotionally mature pastimes. If you lead an active lifestyle, mention it.