29ac Hikes are exhausting: do more training? (7). I have U - S - I - L.
Also 52ac Large circle, in the end twice as high (7). EQUATOR fits, and is a large circle, but I can't parse the wordplay.
52 I can't quite follow it, but have found this parse on another site. "I read it as 'In the end' of (twic)E + QUA (As) + TOR (High) - but I wasn't 100% convinced".
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