Nothing weathers your skin more than the sun, says Sobel. Damaging rays speed up the aging process by slowing down collagen production and cell growth and forcing skin to lose its elasticity. Your best defense is a good sunscreen. Look for a moisturizer with an SPF of 15 or higher that provides broad-spectrum protection, meaning it blocks both UVA and UVB rays.
- Recover Like a ProCheck out these 12 game-changing workout recovery tools.
- Best Health and Fitness Breakthroughs of 2014The year's best health and fitness research.
- 11 Foods Fitness Experts Never EatEven during the holidays.
- The 14 Most Popular Workouts of 2014We highlight the routines that helped you reach your fitness goals this year.