Is it better to see a Cardiologist or GP before you start working out again?

you know how they say to see your doctor before beginning a workout routine? well i kind of want to because i havent worked out steadily in over a year. but should you see a cardiologist or general practitioner? i know the cardiologist is a specialist but they're basically checking your heart before you start working out again. and sometimes gps just aren't as thorough.