[fozzieBoston]

At MIT they still force every undergrad to either pass a swim test or take a swimming class. If I recall correctly, the test included both several laps and 10 minutes of treading water (which is harder than it looks).

[vvvnnnnvvv]

I believe the treading is only required for the "boating test", if you plan to sail or row.

[minikites]

I believe Cornell does the same thing.