I run out of breath after approx 5 minutes on a treadmill. How can I improve my lung capacity?

I don't seem to be able to say on the treadmill long enough for it to have a long term effect.
Answer:
Coolrunning.com has a Couch-to-5k program. Basically, it starts with walking for 30 minutes straight. Then, you run in short bursts, but mostly spend the 30 minutes walking. It continues until you're running the whole thing. Running has a high perceived exertion rate, so it takes some time to build up to it, regardless of what kind of shape you're in.

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do it everyday, and a little longer each day. You'll pick up in no time.

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drink lots of water the more you run the better you will get and start at a slow pace and work you way up

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You might want to go get your heart check out. Get a stress test done.

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run more slowly. Find a pace where you can run more than 5 minutes. Over time (a few weeks) you will be able to increase your speed. But for jogging, you are supposed to find a speed that allows the exercise to be aerobic. When you run out of breath you've used up your oxygen, and the exercise becomes anaerobic.
Some have to start by walking rather than jogging on a treadmill. If you can't walk for 5 minutes without running out of breath, you may have some health problems, and need to visit your doctor.

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You can practice deep breathing meditation. This is an ancient practice where you simply breath in and out slowly, counting as you do.
As you breath in, count slowly in your head; count as high as you can while inhaling deeply. Hold it for as long as you can count again ( i can make it to 60 now ) and then slowly, deliberately exhale, counting also.Practice it for 5 minutes a day at first, and add a higher count each day until you achieve your goal.
This can also be used as a form of mediation which can reduce your BP, increase your awareness in general, and promote better mental health all around. It hasn't failed me ( along with other practices ) in over 30 yrs.
OH, and if you would ever like to try an exercise in will power, try taking 45 minutes to an hour to eat ONE potato chip.
Have a good day, and keep breathing.

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