<s>[INST] Hi my chest feels tight when I run. I can run a certain amount of time before I become out of breath and have no energy. I play a lot of football so this is the problem. Im a very sporty person. My chest just feels really tight and I cant run no more. I can run for about 10minutes then my chest starts to hurt. I didnt play football for a year. I ve just got into it again. How can I get my fitness better so I can run for longer? [/INST] HelloTightness in chest during exertion need proper evaluation.It may be due to coronary heart disease.You need proper clinical examination and investigations.Investigations include routine hemogram,random blood sugar,liver function test,renal function test,lipid profile,urine RE/ME,ultrasound of abdomen,TMT,ECG in all leads,ECHO.Angiography can be done after evaluation.Proper treatment depend upon findings.Get well soon.Take CareDr.Indu Bhushan </s>