Core Strength Secret Revealed
4:02–4:46 · 44s
Mel shares how Olympic coach David Marsh credits his teenage daughter’s national-class butterfly time to core strength—even though she only swims two or three days a week.
4:02–4:46 · 44s
Mel shares how Olympic coach David Marsh credits his teenage daughter’s national-class butterfly time to core strength—even though she only swims two or three days a week.
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