Hi and welcome. I too have been overweight since a young age. I've never heard of Plexus, I'll have to look it up, but I'm glad you've found something that is working for you.
As for mental motivation, I guess it's different for everybody. Whether your motivation is setting an example for your son, trying to stave off weight related health issues, wanting to look better and get fit for confidence, etc. I'm sure you'll find your drive.
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