I tried using this with the Momentum Plan a few years ago. I never saw it written out for the PointsPlus program, but I haven't needed it on PPlus.
What the Wendie Plan hoped to accomplish was to stagger all of your Points throughout the week. Having one High Points day sprinkled with Lower Points days.
You NEVER went below your Daily Points. Your Lowest Points days were always your Daily Target to the point. It was not severe. It was merely your Daily Target. No more, no less on those days. Your Highest Points day was about 15 Points more than your Daily Target. (Again, this was on Momentum, so the Points are NOT PPlus.)
I was personally using it as a way to make sure that I was eating all of my Daily & Weekly Points. It's honestly just a schedule for your Points. I very much so liked it for this reason. However, since using PointsPlus, I just haven't had a need since I'm using my Points more reasonably on this plan.
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If you're struggling with a plateau, adding in some exercise can be good, but what else are you doing?
Have you checked your Daily Target? Have you experimented with eating fewer Weekly Points or fewer Activity Points? Have you added in more protein, or more fruits and vegetables? (Or fewer?)
What you eat can matter just as much as how many Points. If you're having a hard time, I suggest making a post with your Weekly Food & Exercise information. Members are more than happy to take a look and give suggestions about what they see! And sometimes a few changes here or there can really add up on the scale.
Keep going

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