10 ideas for 30-day challenge
1. Learn (re-learn) programming language (Python)
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2. One part (30 units) of Pimsleur's French course
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3. Memory training (Ron White, for example)
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4. Calligraphy (or: handwriting with left hand)
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5. Accent reduction course
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6. Copywork of Seth Godin's blog
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7. Develop an online training course (or: write a book)
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8. 30 days coffee free (or: sugar, meat, bread, whatever)
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9. Home renovation
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10. 30 day fitness challenge (push-ups, plank etc)
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11. 30 day of writing 10 idea lists on random topic (input: Random word generator site)
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