Guys like using this exercise system starting to build muscles (6)
I believe the answer is:
glutes
'build muscles' is the definition.
Although both the answer and definition are verbs in their -s form, I cannot see how they can define each other.
'guys like using this exercise system starting' is the wordplay.
'starting' says to take the initial letters.
The initial letters of 'guys like using this exercise system' is 'GLUTES'.
'to' acts as a link.
Can you help me to learn more?
I've seen this clue in The Guardian.
Want a hint initially instead of a full solution?
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