When a routine works, there's no need to mess with it.
Floyd Mayweather posted this video of him taking a sponge bath and claims that he starts every day by taking one. The 37-year-old has had a great boxing career, so if sponge baths help, there's no need to change his routine.
Plus, Mayweather is able to multitask by brushing his teeth while taking said sponge bath. Not a bad way to save some time, and time is money.