do a var_dump($this->getTrainings()) it will print directly to output so it will probably mess up the output in the browser see the tip in http://www.php.net/manual/en/function.var-dump.php if this a problem. If it is an array current($this->getTrainings())->__toString() should work. If it is an array you should have the same problem in 5.2 though.
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