Obviously physical exercise alone helped the person who started the thread, and apparently a few others, unless they are lying. I believe them. It really doesn't surprise me at all that a person could rebound from DP totally just from exercise alone. Some people recover over time, naturally. Some people claim dieting and exercise helped them recover from DP. Some people require more time then others and/or counseling. Some people recover just by going on with their daily life normally. Some people claim to have DP syndrome for life, but that is more rare in my opinion.
One thing is for sure, you have to be careful claiming what helped you recover from DP as a cure. For some reason people get very upset about that. It is one remedy to help treat DP. I dont see the harm in making that claim. There is no harm, as long as people use sensible discretion. Obviously, you don;t want run so much to make your feet fall off. It's healthy to exercise, sensibly. It feels good to exercise. Personally, I am most at peace when Im jogging. Nothing bothers me when Im jogging.