• Homeostasis is the body’s way of maintaining a stable internal environment.
• Adaptations are responses to stressors (like heat or cold) to maintain homeostasis.
• People in different climatic zones (31 in total) acclimatize to accommodate the environment.

• It's a natural adaptation to improve exercise performance and heat tolerance in hot climates.
• Requires exercise in a hot environment, not just exposure to heat.
• Usually takes 10 to 14 days.
• Results in better thirst matching water needs and increased total body water (up to 5%).

• Gradually increase total exercise-heat exposure time towards 90-100 minutes per day.
• Signs of successful acclimatization include lower heart rate and core temperature during sub-maximal exercise, and higher sweat rate.

• Increased plasma volume
• Earlier onset of sweating (at a lower core temperature)
• More dilute sweat (reduced electrolyte loss)
• Reduced rate of muscle glycogen use
• Decreased psychological perception of effort

Real-World Example: Athletes training for the Olympic Games in Tokyo (hot and humid conditions) would benefit from heat acclimatization to improve their performance and reduce the risk of heat-related illnesses.