Although I am not obese I tend to get very exhausted after 2-3 minutes of running (max). So how can I increase the stamina for running.
Although I take healthy diet but still get exhausted easily. I have no heart condition either.
You just need to build it up gradually, and not start too fast.
Start by running from one lamp post to the next. Then walking the next one. When you can manage that ok, run 2 lamp posts and walk one.
Try to start at a pace that feels easy, that you can maintain for the distance.
There is an app you can get for iPhones called couch to 5k which is very good. A run/walk program.
Start slowly, with a run walk program and I'm sure you will see progress fairly quickly.
Good luck on your journey
It's all about pacing yourself. To improve your stamina, start your run at a pace that feels extremely easy to maintain. As the minutes pass, your perceived effort will go up. Gradually increase your run time, while gradually decreasing the time of your walk breaks. Once you hit 30 minutes of continuous running, you can start some short interval work. Run shorter segments at faster, uncomfortable pace. Take walking breaks in between each interval. These faster segments will improve your overall cardiovascular fitness and make your normal pace feel easier, thereby increasing both your endurance and speed. Good luck!