DO HARD THINGS

The Combat Fitness Blog

Aerobic Capacity for Military Selection: Build the Engine

Combat Fitness

Published on: 26/01/2026

Aerobic capacity for military selection decides who lasts to the final cut. Learn how to build the aerobic base, train it under load, and avoid burnout.

aerobic-capacitymilitary-selectionselection-prependurance-trainingvo2-maxruckinginterval-trainingfatigue-resistancetactical-fitnessmilitary-fitnesssof-selectionwork-capacity

Training Density for Firefighters | Work Capacity Guide

Combat Fitness

Published on: 26/01/2026

Training density shows how much work firefighters sustain under fatigue. Learn how work-to-rest structure builds real fireground conditioning.

firefighter-fitnesswork-capacitytraining-densitytactical-conditioningfatigue-resistancefirefighter-trainingfirst-responder-fitnessconditioningtraining-loadmilitary-fitness

Training Density Explained: Work-to-Rest for Tactical Athletes

Combat Fitness

Published on: 22/01/2026

Training density explained - how work-to-rest ratios build work capacity, fatigue resistance, and operational readiness for serious tactical athletes.

training-densitywork-capacitytraining-loadconditioningtactical-conditioningwork-to-rest-ratiotraining-variablesfatigue-resistancemilitary-fitnesstactical-fitnesshybrid-trainingprogramming-principles

Capacity vs Capability: What's the Real Difference?

Combat Fitness

Published on: 22/01/2026

Capacity is what you can do once; capability is what you can do repeatedly, under fatigue. Learn the difference and how to train for tactical performance.

military-fitnesstactical-fitnesswork-capacitytraining-readinessfitness-vs-readinessfatigue-resistancedurabilityinjury-preventionhybrid-trainingtraining-principlesaerobic-capacity