Yes. I would consider you a plus-sized rider because you do have a high BMI, in addition to a larger waist. From a health standpoint, a lot of research now says that a thicker waist makes you more prone to health problems such as heart disease, high cholesterol, and more.
Not saying that I'm Mrs. Fitness or anything, but I am 5" taller than you and 40 pounds lighter, and I still think that I have a pudgy tummy. (You're always your own worst critic.) So with some reference to myself, again, yes I would consider you a plus sized rider.
Good luck with weight watchers! It doesn't matter which "diet" you choose, just as long as it is realistic and something that YOU can stick with.
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