Q: What are those big bands that I see being used at the gym? They come in different colors and are really stretchy, like big rubber bands. Do they provide a good workout? - F.G., Cambridge, NY

A: The bands you are referring to are resistance bands, which are great for working almost every muscle group in your body. The different colors represent different resistances. Many companies market the bands and they are very reasonably priced. Bands are easy to carry with you when you travel so you won't miss your workout.

Resistance bands can be used to work almost every muscle group. Most muscles can be worked using bands in the same way as they are using dumbbells. You just have to secure one end of the band by placing it under a foot, holding it with your hands or tying it to something. Like any exercise equipment, the bands must be employed properly to be used safely: Be sure to control the band in both directions to avoid injury to joints, and before each use, check that the band is free of nicks or tears that could result in its snapping or tearing during your workout.

Source: fitlinxx.com