A breath-hold training app designed for freedivers to help improve their breath-holding capacity safely and scientifically.

Key Features:
• CO2 Training Tables: Gradually increase breath-hold time to build CO2 tolerance
• O2 Training Tables: Fixed breath-hold time with decreasing recovery intervals
• Free Training: Customize your breath-hold and recovery times
• Maximum Breath-Hold Challenge: Test and record your maximum breath-hold time
• Diaphragm Contraction Tracking: Precisely record physiological responses during training
• Training Statistics: Track your progress including personal best, average times, and more
• Multi-language Support: Available in English, Chinese, and Russian

Safety Note: Always train in a safe environment with supervision. Never practice breath-holding in water.