"Keep yourself hydrated by drinking lots of water and eat vegetables like kale, spinach and avocado that are high in lysine. This will help improve your tan color," explains Vita Liberata and NKD SKN founder Alyson Hogg. "Additionally, always exfoliate and if you need to shave, do it at least four hours prior to applying the self-tanner." Soap & Glory Sugar Crush Body Scrub, $15 at Ulta

"Choose the correct type of self-tanner that suits your skin and lifestyle," says Sophie Evans, St. Tropez skin finishing expert. "If you have a busy schedule or want to go to the gym or try on clothing in the day and do not reall...