Sāṣṭāṅga can increase your oxygen lavel 25% up

Sāṣṭāṅga:

Lay down on your belly

Touch 8 point of your body to the ground-

• Fore head
• Chest
• 2 Hand
• 2 knees
• 2 big toes

Hold it that way and start breathing

Hold for 6-7 minutes

Relax your body. 

Now you can check the change by Oxymeter.