07/17/2026
Working out in gear isn’t just about fitness; it’s about acclimating your body to work and perform at a high level under the physical demands of your gear.
Turnout gear traps heat and limits evaporative cooling, which quickly raises core temperature and reduces performance.
Exercise physiology research shows that repeated, controlled heat exposure over ~7–14 days triggers real adaptations: expanded plasma volume, earlier and greater sweating, improved skin blood flow, and reduced cardiovascular strain at the same workload (Périard et al., Med Sci Sports Exerc, 2015; Tyler et al., Sports Med, 2016).
Here’s the why that matters: on the fireground, heat stress is one of the primary drivers of fatigue, cognitive decline, and cardiovascular strain.
As core temperature rises, heart rate climbs, stroke volume drops, and perceived effort skyrockets — even if the external workload hasn’t changed. Heat acclimation training manages and slows that response.
By expanding plasma volume and improving thermoregulation, the body can maintain cardiac output, preserve decision-making capacity, and delay the onset of performance decline.
For firefighters, that matters. Heat-acclimated firefighters consistently demonstrate lower heart rate, reduced perceived exertion, and improved work tolerance in hot environments (Sawka et al., J Appl Physiol, 2011; Garrett et al., Compr Physiol, 2014).
In simple terms: the body gets better at moving heat, protecting the brain, and maintaining output when internal heat rises.
This isn’t about reckless suffering. It’s about intentional preparation.
Train in gear with intention. Train in clean gear. Hydrate. Progress gradually. Recover properly. Repeat.
You’re not just building fitness. You’re building a physiological buffer for the fireground.
