This 21-Day Walking Plan Will Help the Pounds Melt Away

This beginner-friendly workout, designed by Galina Denzel, a certified personal trainer and the coauthor of Eat Well, Move Well, Live Well, offers a challenge for each week. In 21 days, you'll lose weight, rev your energy, and build lean muscle. Follow the plan and use these keys to guide your workout.

• Easy: Should feel like a stroll

• Moderate: Pace increases, but you can still hold a conversation

• Brisk: Talking should be tough