S aving money doesn’t have to be boring. The viral 100 Envelope Challenge circulating on TikTok has become a low-pressure way to save about $5,000 in only 100 days — one envelope at a time.

The amount would reach $200 on day 100. If she completes this whole challenge, she will have $10,100 of cash in her jar. While each day has a certain savings amount, Joo allows for flexibility.

For example, she would save $2 on day one, $4 on day two, $6 on day three and so on. The amount would reach $200 on day 100. If she completes this whole challenge, she will have $10,100 of cash in ...