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Your friends suggestion of a water jet to increase currents in the pond is a good one. Koi love to swim against currents as it is similar to being in a wild river where native carp spend much of their lives. I know in our pond they love to swim against the strongest currents and it is common to see them all lined up against the water flow just swimming like crazy for the fun of it. This helps to develop good muscle growth in the whole body.
In a mud pond, like MikeM mentioned, they nearly bury themselves in the mud digging for things to eat in the mud, which is also very good exercise. That is why mudponds are so good for body development even thought they don't have strong currents.
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Larry Iles
Oklahoma
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