5d12f34d_ct_Guides___Health_and_Fitness__MUSCLE_GROUP
[WHAT IT IS?] The ones on the back of your thighs [WHEN DO YOU USE IT?] Lifting your feet up when you walk [WHICH MACHINES EXERCISE IT?] Treadmills, cross trainers, exercise bikes, home gyms [MUSCLE GROUP] 
Hamstrings
Argos Product Guides - Health and Fitness
MUSCLE GROUP