what type of joint used in bending to touch toes

Dear student, 
 
Hinges allow the door to move to and fro.
Knee and elbow joints are examples of hinge joints in our body. These joints allow movement in one direction only i.e., to and fro movement.

Regards

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A hinge joint (ginglymus) is a bone joint in which the articular surfaces are molded to each other in such a manner as to permit motion only in one plane. According to one classification system they are said to be uniaxial having one degree of freedom.[1] The direction which the distal bone takes in this motion is seldom in the same plane as that of the axis of the proximal bone; there is usually a certain amount of deviation from the straight line during flexion.

The articular surfaces of the bones are connected by strong collateral ligaments.

The best examples of ginglymoid joints are the interphalangeal joints of the hand and those of the foot and the joint between thehumerus and ulna. The knee joints and ankle joints are less typical, as they allow a slight degree of rotation or of side-to-side movement in certain positions of the limb. The knee is the largest hinge joint in the human body.

Hinge and pivot joints are both types of synovial joint. A hinge joint can be considered a modified sellar joint, with reduced movement.[2]

Other objects that work like hinged joints are door hinges, closet doors, dog flaps etc.

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here, which type of movement is done?is not asked. In bending, the hip joint is used. of course, it is not only hip joint, but its a complex movement of other joints also used in bending. but, for a 5th class student, we don't go in that detail.  majorly, its a hip joint involvement. and that is a ball & socket joint. so ball & socket joint can not be the right answer?
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