Do they exercise their elbows as they run? (7)

I believe the answer is:

joggers

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'do they' is the definition.
The definition suggests a plural noun which matches the answer.

'exercise their elbows as they run?' is the wordplay.
I cannot quite see how this works, but
'run?' could be 'jog' (jog is a kind of run) and 'jog' is found within the answer.
The remaining letters 'gers' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

I've seen this clue in the Evening Standard.

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