Foam rollers are very helpful when it comes to warm-up and recovery phases of functional training. These foam rollers create more blood flow and extensibility in tissues. This is important because it allows more effective flexibility and work, while providing a a little massage. I say these are like getting a massage because the foam rollers provide a generalized pressure over a specific area of muscle and it helps in recovery phase by allivating soreness of a muslce after a workout.
Tips for using foam rollers, I suggest always consulting a doctor before use, always perform foam rolling as a warm-up or recovery phase, move slowly, work from the center of your body to the outer extremedies, about 15 minutes a day or less is needed, and keep hydrated.
One example of a hamstring roll, will be explained. First sit on the foam roller (foam roller should be horizontal). Next roll on the foam roller slowlyback and forth remember to start at the point that is closest to the center of your body. Last, stop on any knots or sore areas, until the pressure is relieved.
Other benefits of the foam roller is it is great for soft tissue work, help with range of motion, relieve shin splints, alignment, core essentails, and balance training.
Using foam rollers will improve your functional training and relive soreness. Many gyms and wellness centers have these available for use