Most importantly, Siddle explores the psychological and spiritual components which establish the warrior mindset. This pioneering test is a must read for present-day warriors, or anyone involved in use of force, combat or martial arts training.Great Resource Great resource for anyone involved, either as a participant or trainer, in high stress activities. Siddle keeps the focus limited to the relationship between survival stress, escalating heart rates and combat performance but he does an outstanding job of explaining and demonstrating how they interact. Highly recommended.