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A lot of fitness is about contractions - you're doing squats, or you're on a bike and your knees are bending but never stretching all the way, so your muscles get strengthened but look short and thick.
A lot of fitness is about contractions - you're doing squats, or you're on a bike and your knees are bending but never stretching all the way, so your muscles get strengthened but look short and thick.
