If you are physically confident, you will probably be willing to try anything new with your lover. You will also take risks and be physically creative. Along with being more confident and feeling great about yourself, you will probably become more aggressive, always a welcome attitude in love making. Being aggressive in bed can be very sexy and taking charge is something that more people should learn to do. Many people who are self-conscious about their bodies try to hide during sex by keeping the lights off or staying under the covers.
Many people are extremely visual and enjoy seeing their partner while having sex.
So if you feel great about the way you look, you will not be afraid to have the lights on during sex. The more you workout the more energy you will have. The more stamina you have the longer you will be able to last during sex. Once you start working out your strength will increase in no time and you can even try pushing your partner around a bit. Sounds sexy to me.