Spice up your cardio and target belly fat with intervals! This 30-minute treadmill workout plays with speed and changes minute to minute. And switching speeds like this not only improves your overall running stamina,but it also increases the calories you burn when the workout is over.
As always, feel free to adjust the speed up or down as necessary; just produce sure you're challenging yourself. whether you're looking to try running intervals but want to start a dinky slower, or try this beginner's interval design. Click here for a printable version of this workout.
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Source: popsugar.com