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The American Council on Exercise offers these guidelines for choosing the right SPF:
- Estimate how many minutes your skin can be exposed to the sun before the skin starts to burn.
- Figure out the total number of minutes that you'll be in the sun, then divide by the number of minutes it takes your skin to burn.
- The resulting number is the SPF you should look for in a sunscreen.
- Use this formula as a guide. If your skin typically burns within 10 minutes and you plan to be outside for 180 minutes, you would divide 180 by 10 and need an SPF of 18 or higher.
-- Diana Kohnle
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