I've been using this chart:
I just completed Day 5 and that jump up to 40 seconds was rough (trembling was so bad in the last 10 seconds I bet there's a heightened Richter scale measurement!), and looking at the Day 30 hold of 5 minutes almost has me tossing the whole idea. Hold a plank for 5 full minutes?? Seriously, who has 5 full minutes.
With my panic in full swing that I would never be able to build to that I hit up good old Google and decided to blog about it, too, hoping someone will do attempt this with me. Hey, you'll be doing my kids a favor! I found this Plank Challenge and, with the hold times being broken up, I know I can do this! I love that this shows options for the plank positions, too.
The kids are sort of building their own challenge. I had them take the position and hold it for as long as they could the first day, and as long as they at least hold that amount or increase by at least 1 second each day, I approve. After seeing the above photos, I realize they could have been using their knees but um, well, we all make mistakes, right? Guess I'll take that drill sergeant cap and whistle off....
Let me know if you're doing this, too by commenting!