[jatx]

Biking is definitely the way to go if you don't have back problems. Swimming tends to get monotonous, although it is great exercise. I am swimming about 2 miles per day right now, but have been doing so for four months and am starting to get burnt out. Biking will offer you much more variety and is easy on the joints. If you like to run, but your body can't take the impact of mileage, you might look into an AquaJogger. It looks kind of gay but is great exercise. Imagine a really bulky pair of blue styrofoam depends and you'll have the idea. When I used to to ultramarathon events, I did half of my "running" mileage in the water to good effect.

On biofeedback, my lessons were administered by a real psychologist. A good trainer won't get too New Agey on you, because if a visualization or concentration technique is not working for you that will be reflected in your heart rate, breathing, body temperature, muscle tension, etc.. Years later, I can still lower my HR and temperature significantly using only thought. The key is to get a referral from a licensed physician and avoid the holistic healers, IMHO.

Have you ever practiced any kind of meditation? The ability to quiet your mind using some technique will ultimately determine how useful biofeedback is to you. There are many ways to do this, some of which are sure to fit with whatever your belief system happens to be.