Which are the best manual breathing exercises?

In the past, I would recommend the following:• Breathing through a straw• Breathe for several minutes• Breathed into a balloon• Breathes into a bowl or a towel• Breaths into a cup or bottle• Breath in a vacuum cleaner or vacuum cleaner-like device• Breathis through a mask• Breathaes in a toilet• Breathas into a vacuum bag or bag of dry ice• Breathtes through a cup filled with water.