Pool exercise (4)
I believe the answer is:
swim
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">pool exercise</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for swim that I've seen before include "Take a dip" , "Do the dog paddle, perhaps" , "At . . . . Two Birds by Flann O'Brien" , "Be immersed" , "progress through water" .)