- Read a non-fiction book such as history, art or language. Write comprehensive notes on it and talk it through with someone.
- Learn 30 extra words of vocabulary of your favourite foreign language.
- Balance your diet: more nutrition, less junk.
- Re-learn how to juggle three balls.
- Meditate every day for 15 minutes.
- Understand an opposing idea rather than just dismissing it.
- Carry a (paper) note-book and capture ideas and review them daily.