"We do a bit of endurance to get them fitter - marching on the spot, moving round the room in a circle to get the heart rate up a bit, " explained Ms Quaeck.

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He kept moving his upper body around in a slight kind of shape or circle, and the movements left a little bit of a visual trail.

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It can circle in the sky for hours, using sensors to track even a moving target.

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The weekly OBV formed a minor negative divergence at the highs (see circle) before dropping below its weighted moving average in March.

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