Reletter
Artwork for The Challenge

The Challenge

Cosmin Angheluta

Explore self-improvement challenges that fit your life. Get our practical advice on motivation, goal-setting, and productivity, along with easy-to-use infographics to help you track your progress and stay on course.

Platform
Substack
PricingFreemiumPublishesWeekly
Issues203Founded5 years agoLast Issue7 days ago
Active

Read this Newsletter

cosmopolitanmindset.substack.com
Artwork for The Challenge

Latest Issues

Nobody Remembers Your Worst Moment. You Just Think They Do.

The Spotlight Log: Seven Days Counting Who Notices — Preview

This week’s newsletter is sponsored by Gettier.App:

Every tool you’ve tried waited for you to show up, at exactly the moment you least wanted to. Tier is an AI accountability co...

7 days ago
2

What Dolphin Trainers Know About Habits That You Don't

The Reward Ledger: Seven Days of Getting Paid on Time — Preview

This week’s newsletter is sponsored by Gettier.App:

Every tool you’ve tried waited for you to show up, at exactly the moment you least wanted to. Tier is an AI accountability...

14 days ago
1

You're Not Bad With Money. You're Saving for Someone You've Never Met.

Stop Saving for a Stranger, Meet Your Future Self — Preview

You type $200. You delete it. Then, you type $50.

It’s a thirty-second form. You have to insert your bank details, an amount, and a date each month. But your cursor still hovers...

21 days ago
4
2

The Challenge of The Month - June 2026

Inside: How to Use AI to Invest Money, The Life Crafting Framework, and How to Push Back on Impossible Deadlines

I thought I couldn’t make it to this newsletter. The past couple of weeks have been full of commitments, and I couldn’t focus...

a month ago
1
Paid

You're Allowed to Miss Once. The Second Miss Is the One That Counts.

The Miss Scoreboard: How to Never Miss Twice — Preview

It’s 11:40 on a Sunday in June. The draft’s been open since dinner. I’ve reread the same four paragraphs so many times that the words have lost meaning. And each pass seems worse than...

a month ago
8

Key Facts

Contact Information
Newsletter Author
Number of Subscribers
Find out how many people subscribe to this newsletter.

Audience Metrics

Subscribers, engagement, traffic and sponsorship for The Challenge.

SubscribersEngagement69Monthly Web Visits
Accepts SponsorsEstimated Cost per Ad

Authors

The writers behind this newsletter.

  • Cosmin Angheluta

    I’ve been overwhelmed, stuck, and searching for direction. Now, I help others break through those barriers with practical strategies, motivation, and tools that actually work.

  • Frequently Asked Questions

    How can I access the email archive for The Challenge?

    You can find recent issues that have been published by The Challenge on Reletter by scrolling up to where it says Latest Issues. Tap on the link for any of the most recent emails or hit More Issues to see older ones.

    How many subscribers does The Challenge have?

    To see how many people subscribe to The Challenge, simply upgrade your Reletter account. We provide readership numbers and lots of other stats for this newsletter so you can decide if it's worth reaching out to.

    How can I advertise in The Challenge?

    Newsletter advertising can be extremely effective when it's done right. Before you pitch The Challenge as a potential sponsor or partner, make sure that you've done your research and checked its newsletter stats with Reletter.

    Then, personalize one of our winning pitching templates and send it to the right person using the contact info provided.

    How much does it cost to sponsor a publication like The Challenge?

    Newsletter ad rates (or CPM) vary depending on many factors, including industry, number of subscribers, open rate, ad placement and more.

    To find out how much an ad will cost, contact The Challenge using the contact information provided and ask for a copy of their media kit.

    How can I find newsletters related to The Challenge?

    Scroll up to where it says Related Newsletters to see other publications like The Challenge. You can also search our email newsletter directory to discover other newsletters that cover the topics you're interested in.

    How do I contact The Challenge?

    Reletter provides this newsletter's website URL above, where you will often find their contact information. We also provide links to associated social media accounts and pitching templates so you can reach out fast.