Can you balance between Running & Bodybuilding?
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First of all, it depends on what is your definition of "balance"? If you want to be just average to good at both, being "good" means being able to complete a 10k run under 60min, and achieve that 40-43" inches Chest + 15-17" inches Biceps, the answer is possible yes.
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However, if your definition of "balance" is being able to run long and fast like a competitive runner, at the same time achieve and maintain like a competitive bodybuilder's level physique, the answer is 97% No, (the other 3% is extra-ordinary, and if they choose to focus on one they might be an elite/pro in that field).
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It's all about goals and priority.