Tell people you begin the day with a swim and they’re bound to reply with a look that’s equal parts envy, bewilderment and awe. Who swims, for exercise, in the morning? Who risks certain athlete’s foot and doesn’t mind going to work with goggle eyes? How many people pee in the pool? Old people and triathletes, that’s who. And everyone. But the reality is that swimming is the perfect impact-free sport for long-term fitness and short-term ripped abs, and while you can do it with nothing but a pair of Speedos and a smile, having a stocked duffel can make the experience more fulfilling than a philosophical conversation with Ryan Lochte — much more.