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Jogging can trim your thighs.
David De Lossy/Photodisc/Getty Images
Runners depend on muscular legs, but that doesn't mean that they must have bulky legs. If you have thick thighs, from muscle or fat, you can trim them down by jogging. Be aware, however, that there are natural limits to how you can shape your thighs based on your individual genetics.
Building Lean Muscles
If you have large, muscular thighs then you probably have more fast twitch muscle fiber than slow twitch muscle fiber. Fast twitch muscle fibers are the muscle fibers that can grow large and that are used in speed sports like sprinting. Slow twitch muscle fibers are long and lean, and are what you use predominantly in endurance sports like jogging. Jogging will develop your long, lean slow twitch muscle fibers while causing your bulky fast twitch muscle fibers to atrophy.This can help slim your thighs if muscle is the source of your bulk.
Jogging can help you shed fat throughout your body, including your thighs, giving you a leaner appearance throughout your body. A 140-pound person burns about 223 calories with 30 minutes of jogging, while a 160-pound person will burn 254 calories and a 180-pound person will burn 286 calories. To lose a single pound of fat you need to create a 3,500-calorie deficit over time. For safe weight loss you should aim for a daily deficit of 500 to 1,000 calories by adding exercise and restricting your calorie intake.
While you can shed fat from your legs and you can change your muscle composition to a degree, according to Columbia Health's Go Ask Alice! Website, some people are genetically predisposed to having muscular, bulky thighs. This means that jogging can only do so much to slim your thighs. But on the plus side, these bulkier thighs give you more power, making you well suited to speed-based sports.
Jogging isn't your only option for trimming your thighs. You can also perform resistance exercises to build leaner thighs. You might associate weight training with bulky muscles, but it can actually help build long, lean muscles if you approach it properly. Choose a light weight -- around 50 to 70 percent of your one rep maximum -- and do 15 to 20 exercises. Good thigh exercises include squats, leg curls, leg extensions and leg presses.
- David De Lossy/Photodisc/Getty Images