15分钟高强度间歇训练（HIIT）胜过一小时有氧运动以减脂和保持肌肉

📝 事实核查: It's true that prolonged exercise is a stressor that increases cortisol. Cortisol's functions include mobilizing energy, which can involve breaking down protein (muscle) and fat. However, this is a normal, temporary physiological response, not a switch that flips at 30 minutes. 🕒 Chronically high cortisol from overtraining and inadequate recovery is what's linked to significant muscle loss and abdominal fat storage, not a single workout session. The idea that it makes you 'hold onto fat' during the workout is incorrect; it actually helps release stored energy (including fat) for fuel. 🧬

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