Eighteen well-trained male swimmers were tested during tethered swimming in swimming flume at nine different flow velocities and in selected strength tests on land. The questions to answer were: how does the value of pulling Force during tethered swimming change with changes in flow velocity in the flume and how closely related that force is to competitive swimming results in comparison to other strength tests? A significant correlation was found between values of pulling force in the flume and competitive swimming velocity in 100 m freestyle. This correlation was stronger than correlation of swimming performance with pulling force at zero velocity or with strength measured in land tests. The strength of relation-ship increased with an increase of flow velocity in the flume.
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