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Core Strength Measures. Upper abdominal strength showed the most improvement over time (P = 0.055) with significance in pre-post measures (P = 0.008). Lower abdominal strength showed a trend over time (P = 0.085) with significance in pre-post measures (P = 0.031). The improvements in back extensor strength were not significant but showed a trend in improvement (P = 0.078)
