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The leg extension machine was created by American fitness guru Jack LaLanne in the 1950s. [3] The first prototype is recognized to have been made under Gustav Zander, but labeled the machine as a form of “mechanotherapy” along with other machines that extended the knee and ankle. [3] The machine was made to target the quadriceps.
In anatomy, extension is a movement of a joint that increases the angle between two bones or body surfaces at a joint. Extension usually results in straightening of the bones or body surfaces involved. For example, extension is produced by extending the flexed (bent) elbow. Straightening of the arm would require extension at the elbow joint.
Bridging exercises are done with a flexed knee to lessen the stretch on the hamstring (a knee flexor) and focus the hip extension work on the gluteus maximus. In that same respect, the reduced knee flexion makes plantar flexion work comparable to a seated calf raise, due to the lessened stretch on the gastrocnemius (like the hamstring, also a knee flexor).
A 36 in (910 mm) reach extender with a secondary trigger and a pole that can be rotated 90 degrees. A reach extender (or reacher, grabber arm, helping hand, trash picker, picker-upper, extended gripper, long arm gripper, extended reach grabber, grabber tool, litter picker, or caliper) is a handheld mechanical tool used to increase the range of a person's reach and grasp when grabbing objects.
For example, when standing up, the knees are extended. When a joint can move forward and backward, such as the neck and trunk, extension is movement in the posterior direction. [10] Extension of the hip or shoulder moves the arm or leg backward. [11] Even for other upper extremity joints – elbow and wrist, backward movement results in extension.
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The rotator cuff compresses the glenohumeral joint during abduction of the arm, an action known as concavity compression, in order to allow the large deltoid muscle to further elevate the arm. In other words, without the rotator cuff, the humeral head would ride up partially out of the glenoid fossa, lessening the efficiency of the deltoid muscle.
Jun. 6—COLLEGE STATION — With funding provided by the 88th Texas Legislature, the Texas A&M Engineering Extension Service (TEEX) ...