The trick to higher scores in the running exercises is definitely running a nice steady pace. If you speed up / slow down much, the score is lower. I sometimes like to follow the different dogs or cats when I do the run; that makes it interesting but it also reduces your score a little bit as you have to speed up to 'catch' the critter you want to follow.
You also have to have your controller in the right spot. I see you both mention holding it, which I know others do as well. Personally, I usually get the best scores when I tuck the controller into the back of my waistband so it is snug and rests on the top of my rear. Some others have reported good success with putting the controller into their bra; I don't find that comfortable so I do not use that method.
I know we all like good scores; but, please don't let it frustrate you if your scores are low. Remember it is FABULOUS that you are up and running regardless of how the Wii scores it!!!
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