Bill Gifford, author of Hotwired, has explained the benefits of heat acclimation training, which involves deliberately exercising in hot conditions to train your body to handle heat more efficiently. The process involves increasing sweat, decreasing the heart rate, fatigue, and increasing the volume of your blood plasma. These changes can be attributed to increased red blood cells and hemoglobin increasing, allowing for a higher oxygen-carrying capacity. For elite athletes, heat training is essential for training and preparation for varied climates, such as the Boston Marathon. However, anyone can start heat training with access to a sauna or steam room, or even a hot bath. The resilience gained from heat adaptation can benefit people of all ages and fitness levels.