I can't stress the benefits of exercise enough. At the end of April I was 15 stone, heart rate was 82bpm and could run for only 6 or 7 minutes before almost keeling over and dying.
This week I'll be running 16 miles in total, I'm down to 13.7 stone and my heart rate is around 63bpm.
Different things work for different people obviously but hitting the road was the best thing I ever did