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Have you ever wondered why so many strength-training programs divide up the major muscle groups in similar ways? Chest and shoulders, back and arms, and legs and core are common combos. While this is far from the only way to tackle resistance training (and it may not even be the best way), teaming up major muscle groups is a

If you’ve heard of metabolic conditioning — or metcon — it’s probably in the context of a class that offers circuit training as a way to build strength, muscle, and cardiovascular conditioning at the same time. But in truth, metabolic conditioning covers different approaches to building cardiovascular fitness, including low-intensity, steady-state (or LISS) workouts, high-intensity interval training (or HIIT), and