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from LIVESTRONG.COM

Foam rollers are an effective rehab and training tool, available in a variety of sizes, materials and densities. Cervical stretching, strengthening, and stability exercises, as well as self-massage and myofascial release, can all be performed on the foam roller. Daily foam rolling facilitates postural alignment of the neck and provides pain relief...

Excellent and detailed explanation of neck trigger points and how to use foam rollers/tennis ball to release.

from Prevention

Roll for recover, not to treat injuries. http://www.prevention.com/fitness/how-to-avoid-foam-roller-mistakes/slide/1

Foam Rolling
from Greatist