(HealthDay News) -- Heat injuries range from mild forms to more serious types, including heat exhaustion and heatstroke.

Heatstroke -- when the body's sweating mechanism quits, the skin become hot and dry, and the body loses most fluids -- can be life-threatening.

The American Academy of Orthopaedic Surgeons offers these suggestions for exercising safely in hot weather:

• Drink plenty of fluids even when you're not thirsty, and take frequent breaks during exercise.
• Get your body in good shape before hot weather hits.
• Limit outdoor exercise to early in the morning or late in the evening, avoiding the midday hours.
• Exercise more slowly and less vigorously for longer periods.
• Wear lightweight clothing, and avoid heavy gear.
• If someone looks like they're having a heat injury, seek immediate medical attention.