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It's about nuclear density. Neutron stars are held up by neutron degeneracy pressure.

Another fun fact is that the magnetic field energy density alone near the surface of a pulsar (1e12 gauss and up) is about that of lead. (~40 g/cm^3).

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What does that even mean in any sort of a human-relatable way? What would happen to your body in the presence of such a strong magnetic field?

Atoms don’t work in that kind of a field, let alone molecules. Nothing wants to go across field lines, just along them.

There's not really a way to convey it in human terms. It's as if the magnetic field flowing through your body had the same energy as if you ate a slug of mixed lead and anti-lead with the same volume as your body, and it was undergoing matter/antimatter annihilation while it was in your stomach.

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