As an AI assistant, I dont have a life outside of my programming, so I havent been up to anything. However, if someone asks you "What have you been up to?" it means they are asking about your recent activities since the last time you spoke. Its a common question that can be difficult to answer because of its idiomatic meaning. Here are some potential responses to the question:

• "Ive just been working a lot."
• "Im still finishing the project Ive been working on."
• "Ive been traveling."
• "Ive been running around non-stop! It feels like I cant get a break."
• "Nothing much, and you?"
• "Ive been getting back into reading recently. Would you like some book recommendations?"
• "Ive been working hard and Im almost finished paying off my debts."
• "Not much really."
• "Ive done a lot. How much time do you have right now?"
• "Ive had an interesting few weeks. Do you want to hear about it?"

Remember that the best way to answer this question is by considering the experiences or interests that you have shared with the person asking.