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CrossFit and the Interference Effect

Traditional fitness wisdom once dictated that strength and endurance training should be separate to avoid the “interference effect,” where endurance work was believed to hinder strength gains and vice versa. CrossFit challenged this outdated approach by blending strength and conditioning within the same workouts, maximizing both in a way that traditional split routines cannot. While CrossFit incorporates pure endurance and heavy lifting days, its signature mixed-modality met-cons effectively bridge the gap, developing both aerobic and anaerobic capacity. This method yields superior fitness adaptations without excessive interference, preparing athletes for real-world demands where strength and endurance must coexist seamlessly.

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