10 ideas for 30-day challenge

1. Learn (re-learn) programming language (Python)

2. One part (30 units) of Pimsleur's French course

3. Memory training (Ron White, for example)

4. Calligraphy (or: handwriting with left hand)

5. Accent reduction course

6. Copywork of Seth Godin's blog

7. Develop an online training course (or: write a book)

8. 30 days coffee free (or: sugar, meat, bread, whatever)

9. Home renovation

10. 30 day fitness challenge (push-ups, plank etc)

11. 30 day of writing 10 idea lists on random topic (input: Random word generator site)