Strength bands, fitness bands, resistance bands, workout bands. Whatever you want to call them, Iron Woody is the largest wholesaler / retailer of layered latex rubber bands. Iron Woody Bands are used by athletes, colleges, pro sports teams and militaries throughout the world. (To read more about Iron Woody Bands, click here.)
Incorporating bands into your lifts increases resistance at the end of lift, where you need it. They also introduce a slight element of instability during the lift which helps develop adjacent muscle strength.
It has been proven that incorporating bands into many of the Crossfit routines will dramatically increase your results. Ask your Crossfit trainer to show you how to do it properly and safely, and see the improvement in your workout results.