20 popular 30-day challenges for self-improvement: which should you do? Published 3 years ago • 900 plays • Length 12:11 Download video MP4 Download video MP3 Similar videos 15:46 20 self-improvement 30-day challenge ideas: build new habits 7:18 how to become the best version of you - 30-day challenge 9:56 i quit coffee for 30 days and loved it! withdrawal symptoms & alternatives 7:11 my daily routine working part-time as a minimalist: work from home