A regular walking program improves your health and may help you lose a few pounds, but it won't guarantee that you'll be able to slide into a pair of skinny jeans anytime soon. Walking primarily uses the muscles of the legs and burns calories, but it may not be enough to promote the significant weight loss needed for you to get slimmer thighs -- even if you go uphill. You can't target a specific body part for reduction. To shrink your thighs, you'll need a complete weight-loss program that will cause you to lose weight all over -- including your thighs.
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For many women, and some men, the thighs are a "trouble" area. They stubbornly hold on to fat that you desperately wish to shed. Unfortunately, you can't control the places from which your body drops fat as you lose weight. The American Council on Exercise explains that this type of trouble zone can be one of the last areas that slims down when you lose weight -- but that doesn't mean you shouldn't try. A combination of regular cardiovascular exercise -- that includes walking -- plus resistance training and healthy, calorie-controlled eating leads to overall weight loss.
If you don't make any changes to your diet, you'll only lose modest weight with walking -- even up hills. A 30-minute walk at a moderately intensity pace of 3.5 mph and an incline of 5 percent burns about 214 calories for a 150-pound person. It takes 3,500 calories to lose a pound. Technically, even if you walk up this incline for an hour per day, it'll take almost eight days to lose one pound. In practice, the weight-loss results are slower. A meta-analysis of pedometer-based walking programs published in a 2008 issue of "Database of Abstracts of Reviews of Effects" showed only modest weight-loss results from walking programs without dietary changes. The average weight lost in nine different studies was 2.8 pounds after a median of 16 weeks. Only a fraction of those pounds are likely to be lost from your thighs.
Don't Give Up on Hills
Hill-walking does burn more calories than level-ground walking, so it increases the intensity of your workout and thus can get you weight-loss results faster than if you stuck to flat roads. Hill walking provides more stimulation in your quadriceps and hamstrings than level ground walking. This may not make your thighs slimmer, but it can give them a more toned appearance. Add in two total-body resistance-training sessions weekly that include moves such as squats and lunges and you'll get even more thigh-muscle definition. If you combine regular hill-walking workouts with an eating plan that has you consuming fewer calories than you burn daily, you're more likely to experience weight-loss -- and thigh-slimming -- results.
Running Versus Hill Walking
Running may be a better bet than walking when your goal is weight loss. A study in an April 2013 issue of "Medicine and Science in Sports and Exercise" showed that people who ran regularly showed a greater change in body-mass index than those who chose walking for exercise. While hill-walking may not give you as high a calorie burn as running, it is easier on the joints and more accessible for all fitness levels. Another study published in a July 2011 issue of "Medicine and Science in Sports and Exercise" concluded that uphill walking at a slower pace put less pressure on the joints of obese adults than walking fast on a flat terrain.