I am obese and 69 years old. My daughter said to me last month, Mom, you don't want to be this size when you are 70. So I joined a gym. I am very sedentary and I now wear a fitbit. Without any extra effort, I am lucky to get to 1,000-1,200 steps a day, but at the gym, I ride the recumbent bike and have built up my time on it and also my rpms. I've gone from an average of 70 rpms to 78 and I now ride it for about 45 minutes. My steps have gone up to 8,000 - 9,000 but I really work for that. I still get out of breath, but I stop every now and then and take a little rest. Maybe some day I will try the elliptical, but my doctor told me not to use the treadmill because it's hard on the knees and I already have a knee replacement.