Clear your mind and focus only on breathing and nothing else.
Draw a steady and slow breath, counting to three as you inhale.
Wait for another count of three and focus on the air in your lungs.
Slowly exhale to the count of five and listen to the breath as it flows from your mouth. Focus on the breath being released from your lungs as well. Keep your breath consistent for the entire count of five.
Hold the breath out for another count of three and repeat.
Lie down on a flat surface with nothing altering the elevation of your body.
Slowly raise your legs upward to a 90-degree angle.
Inhale slowly to a count of three as you keep your legs suspended.
As you exhale, slowly lower your legs to the floor at a count of 10.
Repeat the exercise at least five times for the best results.
Get a rubber balloon or a bag of rubber balloons.
Take a deep breath in and place the balloon to your lips.
Exhale into the balloon with a single breath. This will provide resistance to your lungs. Do not take an additional breath with the balloon, but tie it off after the one exhaling breath. This will give you a clear visual of how strong your lung capacity is and how it improves over time.