Our expert says:
Difficult to say for sure - it could be that you have asthma, or a condition called exercise induced asthma, and that is something you can only diagnose if you have an exercise test with a pulmonogist.
It could also just be familiarity with exercise. At the risk of being flippant or dismissive, it's pretty common to have a short limit before one feels breathless. Fitness and training are the only way to improve it, and so if you progressively increase your training volume, you should overcome this problem.
For example, if you can make 5 min at 7.5 km/hour, then my advice is to start with 3 min at 7.5 km/hour, run it and then walk for 3 minutes. Repeat this five times, and you'll have a 30 minute session consisting of 3 runs and 3 walks. Should be manageable.
Give that aw eek or two, then consider stepping up to 4 minutes of running, or drop the walk to 2 minutes, whichever you prefer. By doing this, you'll systematically increase the stress of training, but also adapt to it!
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