Something i'll ad to that previous post: Be careful when using weights and such, especially if you are using them running and you are only new to it (though, running with weights would be fucked as it is.), becuase they can put excess strain on body parts i.e. legs if they are heavy enough and cause damage if your body is not used to it. But usually the idea is that they are only designed for power walking (i.e. walking fast, with your arms moving heavily), because they add resistance to your arm movement and cause a heavier cardio burn.