I used to exercise 3 hours a day everyday and practice martial arts 2x a week for 1.5 hour a time
But I was a wreck back then!. I always had some sprain or some ache.
For the last 8 years Ive done
no exercise at all - Im sure Im not fit...but I feel OK....[pant pant]
Heck - this is why god invented scooters and dive boat lifts
. Luckily living in asia there is always a little man around who will do the heavy lugging
Most of the people I dive with are fat bastards
On a related note: A good friend of mine and an experienced Rebreather diver just had an emergency bypass operation. When I went to see him in hospital one of the first things he said to me was " Im glad it didnt happen whilst diving as I wouldnt ever have made it and everyone would have blamed the rebreather"