Swimming is fantastic for weight loss, it's about as good as running, easier on the joints, and uses muscles besides just the legs so I definitely recommend doing that whenever you can.
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Member of DaJoGen MMA school under Dave Hagen and Team Chaos fight team under Denver Mangiyatan and Chris Toquero, ran out of Zanshin Martial Arts in Salem Oregon: http://www.zanshinarts.org/Home.aspx,