SAMA HOOLE: Training in the morning syncs with this natural spike. You use the cortisol for its intended purpose: physical exertion. Result: Cortisol levels drop after training. By evening, you're calm. By night, you sleep perfectly.

Cortisol pulses naturally in the morning. Peaks around 6-8am. This is intentional.

Cortisol mobilises energy. Increases alertness. Primes you for activity.

Training in the morning syncs with this natural spike. You use the cortisol for its intended purpose: physical exertion.…

— Sama Hoole (@SamaHoole) November 28, 2025

Cortisol pulses naturally in the morning. Peaks around 6-8am. This is intentional. Cortisol mobilises energy. Increases alertness. Primes you for activity. Training in the morning syncs with this natural spike. You use the cortisol for its intended purpose: physical exertion. Result: Cortisol levels drop after training. By evening, you're calm. By night, you sleep perfectly. Training in the evening, especially with caffeine and bright lights? You spike cortisol when it should be declining. Now you're trying to sleep with elevated cortisol, high body temperature, and a nervous system that thinks it's under threat. Result: Terrible sleep. Wake up unrested. Repeat. Morning fasted training works with your biology. Evening fed training fights it. One builds you. One breaks you.