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Okay so I've figured out I can't do a 20 minute 6kg medicine ball work out and then run - or at least not without wanting to curl into a ball when I've got to the bottom of the street and I'm thinking about the fact that I have to run back up that hill that seemed so easy to come down!
So less than a mile today but all in all the same 35 minutes worth of exercise so not terrible.
I think I need a smaller medicine ball too!!