Cryptic crossword clue
Impossible to feel limber with piece rewritten about gym 13

The most common and most likely answer to this crossword clue is the 13 letter word IMPERCEPTIBLE

I've seen this crossword clue in The Daily Telegraph
I
M
P
E
R
C
E
P
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I
B
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E

Buddy explains!

The straight part
We know that "Impossible to feel" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case impossible to feel = imperceptible.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does IMPERCEPTIBLE mean?

IMPERCEPTIBLE adjective
  1. Not perceptible, not detectable, too small in magnitude to be observed

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