Spray sunscreen for your back is the simplest move.

Use a spray sunscreen. It’s not perfect—you’ll miss a few spots—but you can cover your own back by twisting and spraying in a wide arc. Just hold your breath and close your eyes.

The better option is a back applicator (basically a long-handled sponge). Costs about $10, zero waste, and you get even coverage. No awkward contortion required.

Either choice beats the person next to you awkwardly rubbing lotion on you at the beach.

Don’t skip the back because it’s annoying. Melanoma doesn’t care about your flexibility.