It's true to some extent ... cardio and weight training are somewhat opposing ideas. However, I don't think volley ball is too bad since there is little running around and mostly involves jumping (using explosive power of large muscle groups).
If you like to play volley ball then keep playing. If you like to body build then keep doing that. However, you may have to accept that your results at both will not be ideal when doing them concurrently.
IW
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