The higher the Sun Protection Factor (SPF), the longer it works against uttraviolet-B (UVB) rays, which cause burning and may lead to skin cancer. * Formulas have also strengthened their defense against short ultraviolet-A (UVA) rays, which are considered the chief culprit behind wrinkling. * Sunscreens absoib the rays so they don't reach your skin. Here are some tips: * When sitting in a chair, use a lumbar support or rolled-up towel in the curve of your lower back to relieve lower back strain (this makes it impossible to slouch!). * Adjust your chair's height or position on the couch so your feet are flat on the floor. * Instead of sinking inlo your hip when standing for a long time, put one foot up on a stool or a similar footrest to keep from straining your lower back.
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