The effect of fitness watch on fitness The benefits of low-intensity fitness training are well known. Those long, slow endurance runs form the basis of high-intensity training, improve our ability to inhale and expel air, and help us use fat as an energy source rather than the rapidly disappearing glycogen. But sometimes, they get a little boring and you wonder how to make running fun again....

The effect of fitness watch on fitness The benefits of low-intensity fitness training are well known. Those long, slow endurance runs form the basis of high-intensity training, improve our ability to inhale and expel air, and help us use fat as an energy source rather than the rapidly disappearing glycogen. But sometimes, they get a little boring and you wonder how to make running fun again....