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Tightening and releasing your butt will get your glutes more engaged in your workout. Try squeezing your butt for several 10-second intervals during your walk. Don't keep your glutes tightened for the entire duration of your walk. Clenching your cheeks for long periods of time can change how you walk and lead to hip and back pain. After walking for five minutes, switch to walking lunges, doing 25 reps per leg. Lunges improve your balance, stretch your muscles, and work your legs and butt. Just make sure you keep proper form so you don't injure your knees or lower back. Begin with your feet hip-distance apart. You can place your hands on your hips for balance, or do whatever feels comfortable. Take one huge step forward, planting your foot firmly in front of you. Lower your body, bending your knees to a 90 degree angle (or 45 degree if you're just starting out). Don't extend your front knee past your toes your knee should always be right above your foot. Bring your back leg forward and rise again to a standing position. Then repeat the lunge with the opposite leg. Squats are considered one of the best, most effective workouts for a shapely rear. You should practice them at home to get comfortable and master the correct form before trying a walking squat. You want to make sure you sink your hips, keep your back straight, and stick your butt out behind you so you don't injure your knees. Start with your feet together. Step out to the side with your dominant foot (you will be moving laterally, so if you are walking down a path you may want to turn to the side, leading with your dominant foot). Slowly lower your hips, making sure your knees don't extend past your toes. Rise back into a standing position, bringing your nondominant foot in next to your dominant foot. Do 12 reps. Your squats will carry you sideways, with your dominant foot leading. Make sure you perform the exercise on both sides, alternating leading with your dominant and nondominant foot.
Squeeze your butt cheeks periodically as you walk. Add a walking lunge to your routine. Incorporate squats into your walk.