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healthyliving.azcentral.com/thigh-flexion-leg-extensions-11372.html

Flexion and extension of the legs, or other parts of the body, involve two different joint movements. Thigh flexion, more commonly referred to as hip flexion, occurs when a exercise’s movement decreases the angle between the thigh and hip. In contrast, an extension exercise increases the joint’s initial angle. Flexion ...

en.wikipedia.org/wiki/Flexion

Flexion of the shoulder or hip refers to movement of the arm or leg forward. Extension is the opposite of flexion, describing a straightening movement that increases the angle between body parts. For example, when standing up, the knees are extended.

www.ideafit.com/fitness-library/ankle-flexion

The ankle joint is constantly exposed to extreme mechanical conditions during even the simplest motion, such as gait. A hinge joint with only the ability to create flexion and extension freely in the sagittal plane, the ankle (tibiotarsal joint) controls movement of the leg relative to the foot.

www.youtube.com/watch?v=s0mU-D503Tc

A BlueLink video depicting knee joint flexion and extension. Visit our website to learn more about our project. https://sites.google.com/a/umich.edu/bluelink/

www.synergyclinic.net/flexion-exercises-for-low-back-pain

For those conditions please visit the page Low Back Pain Extension Exercises. ... level exercise, and is good for those who sit for long periods. It moves the lumbar spine through its full range of flexion and extension and is convenient enough to do anywhere. ... Repeat 20-30 times for each leg, then try the same thing again but this time with ...

www.t-nation.com/training/truth-about-leg-extensions

The group found that all three parameters were greater with leg extension exercises at 0 and 30 degrees of knee flexion – the most "functional" ranges of motion in early rehabilitation cases. (We don't spend as much time in deep squatting positions, so this is very significant.) (1) Don't get your hopes up, leg press groupies!

www.youtube.com/watch?v=R4pYOFM68KY

Video with mostly drawn illustrations of flexion and extension of the hip and knee joints; The hip flexors, quadraceps, hanstrings and the gluteus maximus are the main muscles of these functions.

www.wisegeek.com/what-is-the-difference-between-flexion-and-extension.htm

In anatomy, flexion and extension are two opposing movements that muscles can perform about a joint. Flexion is a motion in which the angle of the joint involved decreases, as in bending the elbow so that the forearm is brought toward the upper arm. Extension is a movement that increases the angle of the joint, as in straightening the elbow.

www.livestrong.com/article/415200-leg-press-vs-leg-extension

Both the leg press and the leg extension train your legs, but the leg press is a compound exercise using both the knee and hip joints, and works all the upper-leg muscles, including the hamstrings. The leg extension machine is an isolation exercise, using only the knee joint. It targets the quadriceps.

www.verywellhealth.com/lying-leg-extensions-296836

Regardless of the terminology, prepare for lying leg extensions by positioning yourself with good alignment and engaging your core muscles. As the leg lifts, pelvic and trunk movement will likely result. Your job, or rather the job of your abdominal muscles, is to not let that movement happen; this is how core muscle strength is built.