I'm used to tossing a heavy bike like an FJR around corners. It's physically demanding as I lean way off the bike on each curve. You should have a much easier time on your Gixxer. For me, twisty roads are also a mental workout as I'm intensely focused on the next curve.
I'm also in pretty good shape, but I'm no spring chicken. I stop often to stretch, drink fluids, and pee. Are you taking a tank bag?
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