Dear, you will definitely get more stamina by following these very useful tips.
* you should take proper balanced diet first. That means you have to take vegetables, milk, chapattis or rice, butter / cream, cereals (daals) or cheese every day.
* very important thing, do not miss or skip your meals at any cost and take meals on time
* drink atleast 2 litres of water daily.
* proper 6-8 hours sleep is very important. If your sleep is less than 6 hours, then you feel tired very early. So complete your sleep.
* do breathing execises daily in morning & evening.
Just sit down in peaceful place, close your eyes, take deep and long breaths in and out. Do it atleast for 10-15 minutes daily.
*take a walk, in first walk normally for 10-15 minutes for 15 days. Then slowly walk fast and slowly start running. You can do it on treadmill also.
* you can do surya namaskar yogasan daily to improve your stamina under the guidance of yoga expert.