Don't play unless you're willing to pay.
You have a chance in getting hurt in anything. As others have said, STFU and train. If your classes start in October the best thing that you can probably do is start to do cardio. In my experience in Aikido and taking ukemi, the times I get hurt are the times that I got tired in class and didnt end up taking good ukemi. So just start running and maybe some light weight lifting if you want, never really hurts.
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