[header] How to do a chest roll [title] Make sure you're stretched and limber. [step] Before doing any gymnastic maneuver, it's imperative that you properly stretch and train your body. Because of the nature of a chest roll, you'll want to pay special attention to your back, neck, and abdomen. 
[substeps] Attempting a maneuver without proper stretching can cause serious injuries, including dislocations, muscle strains, and spinal injuries. Practice and perfect the form of a gymnastic move (in this case, the chest roll) before attempting to actually do it as a moving maneuver.