Discover fitness events & pop-ups happening all across St. Louis using this calendar!  This page will be updated regularly with new listings, so check back weekly or get on the email list for a weekly drop.  Hosting an upcoming event?  Add your listing here! 

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Events for December 21, 2025

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Moonbird Yoga Troy Grand Opening- FREE Classes ALL Weekend

FREE Classes – ALL Weekend
Moonbird Yoga, Troy, IL 114 S. Main St., Troy

Join us on Friday night for the official grand opening party, then join us Sat, Dec 20 & Sun, Dec 21 for FREE classes all weekend. Beginners, day-dreamers, seasoned movers - come as you are. On Saturday, Dec 20 & Sunday, Dec 21, we’re hosting a series of free classes for you and your family!...

Free

Ugly Sweater – Walk and Talk!

✨Get ready for some holiday cheer! ✨ December 21st with a festive walk, ugly sweaters encouraged at Grant's Trail! 🎁👟 Can’t wait for everyone to join us for some festive...

Free

Ugly Sweater Run @ 4 Hands at The District

4 Hands at The District 17081 N Outer 40 Rd, Chesterfield

December is stacked, sparkly, and absolutely overflowing with community energy — and we cannot wait to run straight through it with you. ❄️💙 Here’s what the month looks like for...

Free