Walking is one of the best exercises for losing weight — it’s relatively easy to do (and easy on the joints), it’s free and you have to do it every day anyway! To start walking for fitness, try to begin with a 20-minute walk every day. If that’s too much, start smaller. But do set a goal of building to 30 minutes a day, every day. In a 12-week study of significantly overweight women, those who walked for 30 minutes, five days a week, lost weight at a rate similar to women who walked twice as long — 60 minutes, five days a week. Once you’ve built up strength and stamina, you can increase your pace and lengthen your walks for greater cardiovascular benefits.