If you are new to posting on this thread, or if you are new to planking and isometric exercises, we welcome you! If you are returning from a previous thread, we welcome you, too.
There are no set challenges - this is a mixed-ability / mixed-experience / everyone welcome group.
Just pick the target that you would like to achieve this month and post updates throughout the month as you work toward your target.
If you are new to planking it is a good idea to start with as little as 10 or 15 seconds and build up over time.
Here is an example 30-day plank challenge for beginners
Feel free to share your variations and challenges.