I Have Left Axis Deviation & Am Morbidly Obese. In

I have left axis deviation & am morbidly obese. In a bid to reduce my weight I'm going to start a health program including excercise - so I wanted to check if it's safe for me to do interval training - 20 secs of getting my heart rate as high as possible by running on spot/star jumps etc and then 40 secs rest. And repeating this for 20 mins. Thank you.