High intensity interval training (HIIT) has been promoted as a time-efficient way of doing cardio. Advocates of HIIT often claim that HIIT is superior to moderate intensity steady-state training (MISS) for fat loss. However, whether HIIT produces more total fat loss over time has not been confirmed in long-term research that measured body composition. A new meta-analysis reviewing 54 different studies has now finally answered the question, which is better, “slow and steady or hard and fast”…