hello sci
I'm a med student, and in general i have a good life which allows me to develop myself in a number of ways through various hobbies. however since leaving high school, I haven't been required to really interact with any rigorous math or physical sciences, and I'm worried about losing my skills in those areas: specifically in abstract problem solving towards technical problems.

I'm busy like everyone, but I'd like to take up a new hobby to help me develop and maintain those skills again. Do you have any suggestions for hobbies that would push me to solve such problems, and apply/learn more math along the way? Obviously i would prefer if the hobby were fun or interesting. Just looking for ideas for how i can maintain and grow this skill set.

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