Many people use a treadmill to burn calories, help achieve weight loss goals, and help with cardio training. But how accurate is your method of estimating calories burned on the treadmill? When tracking the number of calories burned during a treadmill workout, there are many factors to consider. From your age and body weight to the intensity and speed of exercise, there are many ways to influence your final calorie burn mark.

A treadmill is great for cardio, but it doesn't do anything for the upper body. Dumbbells are a good choice for upper body strength exercises. How to put them together for a challenging workout? One way is to turn running time on a treadmill into a circular workout, using dumbbells for upper-body exercises. To prepare, place a pair of dumbbells weighing between 2.5 and 5 kg (depending on your strength and experience) next to the treadmill.