some good ways for physical conditioning ...

1. walk a lot of miles. walking is still one of the finest exercises ever invented. surprisingly few people do it. to increase calorie demands, walk quickly (Power Walking), put on a light backpack with 10-20 pounds, or walk up steep hills.

2. swimming .. also excellent. a lot of people reject this because they are not good swimmers. but you can put on some swim fins and use a floatation aid - you will still burn a lot of energy if you do laps. swimming is great to avoid injuries and recover from the.

3. elliptical machines. ive always found these machines to be particularly good for burning calories while avoiding injuries from repetitive impacts.

cheers, Pete