Hi Judson!
I just agree with the other ones. Don't worry, just start practice. Aikido is adjustible to every size. We have people from 1.5 m to 2.1 m (sorry, I'm European). I myself am a middlesized women and it's always a challenge for my Aikido to train with someone of your size and weight or with someone that is much smaller or much stiffer than me. Don't worry, really.
Simone
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