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The Uchiha have bodily strength, they have the sages powerful chakra gene(which is physical) powerful chakra can't exist in a weak body otherwise the body would get destroyed through overload.
I think it has less to do with chakra and more to do with Hagoromo's Yang affinity. Him wielding the Yang seals implies he was more Yang dominant which explains why Uchiha incarnates have naturally strong bodies.
Uchiha incarnates have the largest reserves after Senju incarnates and also have Senjutsu affinity, likewise Senju and Uzumaki incarnates have the most potent chakra after Uchiha incarnates.
The difference is Uchiha incarnates don't have more physical energy than Senju ones and Senju incarnates don't have more potent chakra than Uchiha ones.