The ground does not provide a counter force to gravity in the sense of the ground manufacturing energy and adding it to the ground/person system. The stability of bulk matter (the reason the ground supports you, even under reasonable loading) is explained by the Pauli exclusion principle (short range) in combination with Coulomb's law (long range). Reference http://en.wikipedia.org/wiki/Pauli_e...lity_of_matter
Another way of understanding mass inertia under the Pauli exclusion principle is by analogy to a randomized angular momentum field. All mass particles have intrinsic spin regardless of charge (Pauli) AND many have an "orbital" spin (Coulomb) between charged particles. Spin, like a gyroscope, resists planar rotations. This is the source of many properties we associate with the mass of matter.
Fermions (which exhibit "mass") obey the exclusion principle and have half-integer spin. The -- half integer spin -- is like a single gyro (or an odd and therefore unbalanced number of them). Being randomized the single gyro (half-integer) spins of a mass of fermion particles resist all applied moments in all orientations more or less equally (push or pull), hence the inertial mass properties of matter.
Bosons (like photons and Cooper pairs and few others) have integer spin -- and do not obey the exclusion priniciple -- Integer spin is like each particle having two equal and opposite half-integer gyroscopes at right angles to one another (or a balanced and even number of them). They don't interfere with each other at all. But since each automatically counters the out of plane resistance of the other when a planar rotation is applied -- no resulting resistance is seen and thus mass inertia is not a property of bosons. What seems a lack of a property is in fact a great deal more of something else.
Inertial cancellation is seen when spins of fermions are paired in a way to make them a zero-spin condensate -- which makes then into a constructive boson, and thus losing many mass properties. Superfluid helium exhibits this inertial cancellation -- and for this reason -- as it achieves a zero-spin state.
Photons have zero mass. But photons have momentum and often a very large amount of it. Radiometers work. Gamma rays, anyone? (Paging Dr. Banner!) (Query: Does the Hulk exhibit internal strength/power?)
This analogy to macroscopic spins illustrates why zero mass with momentum can be the case -- and why momentum, which we usually treated as a synthetic quantity of mass times velocity, is actually a more fundamental quantity of nature than mass. Mass can be seen as merely one analytic abstract of the more concrete quantity of momentum. The orienting aspect of orbiting charged particles under Coulomb's Law is left as an exercise for the class.
In other words -- it really is all about the spirals.