For exercise fanatics, the advent of summer can be an exciting time. No longer do you have to hole up at the gym - instead, you can don shorts and a T-shirt and head out into the great outdoors for a bike ride, jog or yoga session. However, if you do plan to partake in some outdoor fitness, there are a few safety tips you must keep in mind.

Hydration, hydration, hydration
The No. 1 rule for outdoor exercise is to stay hydrated. Unlike a temperature-controlled atmosphere of a gym, where water fountains are easily accessible, working out outside puts you at risk of dehydration, which can come on quickly and without any warning. Before you head outside, make sure you have brought along at least one large water bottle. For longer workouts, you may want to purchase a "camelback," a water pouch that can be strapped to the back.

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.

Support yourself
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.