Whenever you exercise with this watch, if you use your arms, the steps are over counted by significant amounts. Because I contacted Fitbit several times to understand and correct this problem, I cannot return this watch as it is past Macy's 30 day period return policy. My steps were over counted by 4,00 to 12,00 steps when I wore my old exercise watch at the same time. So my calories and health information is way overstated and basically worthless. If you just walk or want your heart rate, the watch is all right, but that doesn't work for me. Fitbit customer service finally admitted that there is no solution to the problem after doing all the updates.