While any change in our weight, up or down, may shorten our life span, yo-yo dieting has not yet been proven to be any worse. Exercise Most people who are sedentary and begin to exercise make the mistake of trying to do a lot right away. If you are under 30 years old you might be able to do this. Starting any exercise program brings on aches and pains in muscles and joints. You can also sprain something.
Most people stop exercising and never restart.
The safe and sure way is to exercise for less than you feel you can do for about 2-3 weeks. You are not rushing to reach a goal but to establish a pattern of healthy activity you can live with for the rest of your life. Try several different things. Walking is a great way to start. You have all the equipment you need.