As a long-term volunteer at Mile 20 of the New York City Marathon, I have seen many things that runners will do, or put themselves through, to get their bodies through that distance en route to the 26 miles and some odd yards of a marathon. Blisters, cramps, and bleeding are part and parcel for the course. So are dehydration, overhydration, and electrolyte depletion. At Mile 20, most runners visiting the medical station want a quick massage or some Vaseline® before heading back out on the course. While a few runners do drop out, most of those are able to wait for the "sweep bus" to carry them back to the finish line. Exceedingly few runners who require medical aid this far along the course need to be ambulanced out.

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