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Keep a good balance between casual and formal, bombshell and girl-next-door, absolutely stunning and subtly sexy. Don't be afraid to take chances with your style, but above all, be sure that what you're wearing is the best possible outfit.  If you feel like getting that extra top or those one pair of jeans will set you over the top, go for it. It's okay to reward yourself, especially if it makes you feel good. If you have a sense of what type of girl he likes, try to dress the part. Don't be anyone you're not, but try to incorporate elements of that style into your wardrobe. Make sure you smell good by taking a shower at a good time every day. If you can't take a shower for whatever reason, give the smelly parts of your body, especially your underarms, a mini bath by lathering up with soap and rinsing with a bit of water. Make sure your hair isn't greasy. Greasy hair, for the most part, is not attractive. If you have very oily skin, you may need to shampoo your hair every two days (or every day if it's really bad). Your face is a big part of what will attract him to you, so make sure that it looks as pretty as possible. There aren't any big changes that you can make in 10 days, but definitely focus on:  Eliminating pimples and acne. If you have breakouts, wash your face twice a day, moisturize after each wash, eat healthy, and use acne-busting products.  Use minimal makeup to cover up blemishes or imperfections. Guys like girls with natural looks, so don't cake the makeup on. Use it sparingly but effectively. Get your facial hair under control, if necessary. If your eyebrows are shaggy, consider getting them sculpted. If you have visible hair on your lip, consider removing it.  Make your lips look luscious and kissable. A small amount of lip balm and lip gloss could send your lips into unstoppable kissable territory. Maybe you love the way that your hair looks. If you don't, it'll be important to find a hairstyle that fits your face. Short hair might be an option; adding curl and volume might be another! 10 days won't be a lot of time for you to get back in shape, but it will be a good start. What's important is that you're treating your body with love and giving it what it needs. Try any combination of the following if you feel like you want to get back in shape.  Join an intramural sports team/league. If you love playing soccer, try to join a league. If basketball is good fit, get together with another group of basketball lovers. Join any team that makes you want to exercise. Consider joining a gym or using gym equipment. Joining a gym will let you take advantage of lots of different equipment, all under one roof. Use the gym to do cardio exercises like running (treadmill, incline), swimming, and cycling (spinning). If nothing else, try to walk for 30 minutes every day. Walking for 30 minutes every day gives your body a small, but important, bit of exercise. If you can't join a sports team or gym, and don't want to do cardio, then walking will help you exercise.
For 10 straight days, wear your absolute best clothes. Always be clean. Pay attention to how your face looks. Find a style for your hair that works. Start exercising.