Crossword puzzle clue "strengthen as muscles"

Here are the possible solutions for strengthen as muscles clue

Answer
Clue
Relevancy
retone
Clue
Strengthen anew, as muscles
tomswifty
Clue
"'I've been doing exercises to strengthen my core muscles,' Brendan said obliquely," e.g.
tone
Clue
Strengthen, as muscles
abs
Clue
What sit-ups strengthen
Crunches strengthen them
What a Bowflex may strengthen
Situps strengthen them
Situps strengthen 'em
Definition
AB, an abdominal muscle

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