As for bras, there are two types:

• Compression. Compression bras fit like a tube. They're usually made of strong, stretchy supportive material that help press your breasts together and lock them down into place. They're ideal for smaller breasted women.
  
  
• Encapsulation (or separation). Encapsulation bras lift and separate like a regular bra but they're made from stronger, more supportive materials. They're best for larger breasted runners. Some larger breasted women feel most comfortable wearing a compression bra over an encapsulation bra to completely eliminate the bounce.

Okay, but what about clothes?

In warmer weather, most people do well with nylon shorts and a light-colored tee or tank made from a synthetic that does not hold onto moisture. Add a pair of sweats and a long-sleeved tee for crisp, autumn weather and up to three layers plus hat and gloves whenever the thermometer flirts with temperatures below freezing. Always carry a water bottle or one of those hydration units worn over the back or strapped to the waist, and use sunscreen. Dehydration and sunburn are issues even in cooler weather.

How many miles should I run to start?

Actually, if your butt hasn't been off the couch in a while, you may have to walk for the first few weeks of your running program. Once you've built up enough stamina to walk for at least 20 continuous minutes, alternate one minute of running with one minute of walking. Gradually increase the length of time you run until you can run for the entire 20 minutes.