A gymnastic exercise (5-2)
I believe the answer is:
press-up
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">a gymnastic exercise</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for press-up that I've seen before include "Face-to-the-floor exercise" , "Keep-fit exercise" , "PE exercise" , "Arm exercise while lying face down" , "Form of arm exercise" .)