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Sorry for your loss.
As other posters have said, it could be chemical (endorphins).
But in another way, exercise can be a momentary distraction and diversion is always good. If you are able to channel your sadness/grief into a goal (like exercise), you will find this is an excellent way to not only move forward with your life, but also accomplish something amazing. And the very act of actually accomplishing something is incredibly rewarding.
Having said all this, you can't make exercise (or any other activity or goal) an escape. If you ignore your grief or bottle it up, it will eventually bubble up when you least expect it.
You need to acknowledge your grief and cry whenever you feel like it. If you want to spend an entire day in bed, then do it. There's a time and place for everything. Some days you need to focus on your grief, and other days you should be working towards something.
The key is balance.
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