My stamina can’t last 5 seconds

harishchandragad trek

I don’t know what’s wrong me with me I’ve taken a couple blood tests and usual checks from the doctor and still haven’t gotten the answer.

I walk a flight of stairs and can feel my heart rate pulsing through my neck very very fast and my breathing gets very heavy. I tried exercising but I end up feeling extremely exhausted (fainting) doing a workout after only 5 mins

Is there a way to build up stamina in one of those guys who seems fit in clothes but is unhealthy on the inside. I want to be stronger and more healthy but don’t know where to start.

Please help

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