Amelia Enfinger, 14, warms up with a jump rope before a CrossFit class for teens in Loyalhanna, Pa. (John Heller/Pittsburgh Post-Gazette/TNS)
As fitness crazes go, the workout programme CrossFit has some of the most dedicated disciples.
The wildly popular, self-directed programme, which puts a focus on core strength training and conditioning, has built a robust online community, where its participants set goals, share routine variations and track their progress.
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