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Half-Orc Half-Halfling would be unstoppable!
Reading up on the half orc.
Apparently they're not as strong as an orc, but the thing is orcs are pretty clumsy, so they combine the strength of the orc with the nimbleness of a human. It's a winning proposition. You don't even need all that much strength if you can direct it effectively.
Nimbleness of a human though? I think we can do better than that. Suppose we combine the strength of an orc with the nimbleness of a halfling! The Orcling would be the Ultimate Physical Powerhouse.