Learn to dive in 2 days, after a couple hours of online training, come in for 2 days after completion and meeting all check out dives, you will be a open water certified scuba diver, diving is great exercise, you do not relize you are doing it since your mind is occupied with all there is to see while diving, you do not have to be a deep diver to enjoy diving a lot of divers never deep more than shallow reef dives, 10-30 feet and enjoy diving as much as any cave diver. The exspense of training is only one time, complete the course successfully you never pay to re-certify, all you need to do is keep diving! Remember the Earth is made up of 70% of water so all of you non-divers enjoy your 30% of the Earth. Diving is a gift that keeps on giving,its also a great career move. Invest in yourself invest in Diving!