Trigger Point Foam Roll the Grid: Large muscle groups in the legs and back a total of
Foam ball 8 cm: pectoral muscle, Delta, Piriformis
Foam Ball 10cm: Po and hip slightly superficial and wider
Black Rumble Roller: back massage after a workout (because it is always painless and really beneficial)
Blackroll mini: calves, Delta, arm - on bare skin exciting massage effect
And now our Blackroll Ball Duo 8 cm:
Perfect for the back extensors. One can thus put back in place super blocked ribs and with that comes even between the shoulder blades, which the large rolls, or the Duoball not create 12 cm to the extent all. For slim people especially useful because it protects the spine.
Conclusion:
Even if it just does not want to go ahead only with the back exercises such as rowing, this ball is worth serious consideration. For more ribs joints blocked anyway. ;)