When I exercise, I walk and run about 5 miles in total. I am getting away from heavy weightlifting and moving toward higher reps for endurance. I do a lot of carpentry and work outside with garden and woodpile and I find that the exercise program nicely dovetails with these activities. After a full day of both, my life absolutely "hums". There is really no comparison between the days I exercise and the days I don't. When the endorphines are flying, I'm much less likely to lapse into the depressions that come and go with bipolarism.