There is a lot that happens in the five milliseconds before Milos Raonic smashes his tennis racket against the ball he just tossed above his head. The head itself (with once wild, now professionally coiffed, hair) is locked back in rapt attention. Six thousand sets of eyes in the arena are focused on that little yellow ball.

Once the summer sun is burning bright, staying indoors begins to feel like a prison. For those of us who eschew the concept of year-round tans from bottled bronzer, summertime is a golden opportunity to head outside for a healthy dose of vitamin D. But what can we do post-beach to help sustain a glowing tan?