From my article featured in Capital Region Living Magazine:
Take your workout to the next level: Mix it up
Exercise Tip of the Month
If you are using the treadmill make sure you are not holding the railings. You can displace up to 50 percent of your body weight by holding on. Better to lower the speed or incline and pump your arms or lightly hold on with a few fingers for balance. You will burn more calories and achieve more fitness if you let go.