If you want to swim without once turning around, there are two ways to do it. One is to clamber down the White Cliffs of Dover, dive in, and head for France. The other is to swim in a swimming pool with a current. Currents are generated in two ways — by drop-in devices inserted in ordinary pools, or by mechanisms built into the pool itself. (Pools of the latter kind can be quite short: Why do you need all that length, if you’re swimming in place?) Either way the effect is that of an aquatic treadmill.
I got one of …
Something to Consider
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