havn t been doing any physical activity for over a year and i ve just gotten back into running. i started with high intensity interval training (run for 30 seconds as hard as possible, then walk for a minute) right away did it for 2 nights like this: 5 min jog 4 mins of HIIT then id mix between walking and running. on the third night i did 5mins jog then 6 mins of HIIT and at the end of the HIIT i experienced pains in my heart area and had a really high heart rate also it felt weird when i took a deep breath but not a normal breath, i started walking and the pain went away, then when i started to jog again the pain came back after a while when my heart rate increased. i dont have a history of anything like this before and neither do any of my family. Am i just starting out too high for this sort of stuff and take it down a noch? btw im 17, 5 11 , and 181lbs.
Get ECG and TMT test done to rule out any cardiac element and then proceed for exercise, pain in chest after exercise and relieve after rest is alarming initial sign of cardiac disease.