5d12f34d_ct_Guides___Health_and_Fitness__MUSCLE_GROUP
[WHAT IT IS?] On your back, near the bottom of your backbone [WHEN DO YOU USE IT?] When standing up straight or carrying something in front of you [WHICH MACHINES EXERCISE IT?] Cross trainers, rowers, home gyms [MUSCLE GROUP] 
Lower back
Argos Product Guides - Health and Fitness
MUSCLE GROUP