1. Hold stomach in with both hands. Then take a deep breath in through your nose and blow out through pursed lips. Repeat 5 times.
2. Now hold our ribcage with both hands. Take a deep breath in through your nose and blow out through pursed lips. Repeat 5 times.
3. Hold your hands down by your side and 'huff' 5 times.
Doing the above daily will bring up any mucus you hold in your lungs.