I'm not a doctor, but in my opinion, if you can spend that long competitive swimming, and you've spent years in a fabric tail, you should have no issue at all with a silicone tail. It's only heavy out of the water
It can seem like a lot at first when you're carrying it around, but you get use to it.. In the water they don't feel heavy or create drag. At least in my experience- some tails wight gigantic floaty flukes may give you some drag. I think you've taken a lot of precaution, and shown that your body and heart are very capable of handling a silicone tail
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