Hydration, hydration, hydration
Watch that skin
You may think that going outside for a 20-minute run won't put you at risk of sunburn, but UV radiation can damage your skin even if it doesn't turn pink. Any time you go outside when the sun is shining, you need to put on sunscreen of SPF 30 or higher, even if you're only going to be out for a few minutes. Sunglasses are also important, as your eyes can be exposed UV rays as well. If you fail to protect your skin while outside, then you may find that you'll need to book your first Botox appointment before you hit age 30.
If you have special gear you use for the gym, you should be using it when exercising outdoors as well. You'll still need sneakers that give your feet good support, even if you're only going for a jog around the block. Women who run for exercise should wear supportive bras whether they're on a treadmill or sidewalk, otherwise, the breasts may sag sooner rather than later. Fortunately, if your bosom does begin to droop over time, you can book an appointment with a board-certified plastic surgeon to discuss a breast lift.
For more, visit The American Society for Aesthetic Plastic Surgery website at http://www.surgery.org/