1st she rebreathes a single breath back and forth between the balloon. Next she exhales into the balloon for 10 seconds, inhales for 10 seconds and keeps repeating this until she is convulsing for air. She pushes herself hard both times.
Description
1st she rebreathes a single breath back and forth between the balloon. Next she exhales into the balloon for 10 seconds, inhales for 10 seconds and keeps repeating this until she is convulsing for air. She pushes herself hard both times.