The better you understand anatomy and biomechanics the more effectively you can program exercise for clients who need correction and/or to restore balance between the right and left sides of the body. There are 11 muscles that flex the hip joint. Each of these muscles also has other abilities for movement. For example, tensor fasciae latae also internally rotates the hip and abducts it. Whereas sartorius abducts but externally rotates the hip. The muscles in the human body all overlap each other in their abilities, making it the machine of many movements that it is.
A sedentary lifestyle can lead to having weak and tight hip flexors as they are always in the shortened position. Tight hip flexors can lead to a limited range of motion, poor posture, lower back, and hip pain, and even injuries. These muscles need to get a workout when you are standing and doing movements such as raising your leg to climb stairs, run, or ride a bicycle.​
Putting the exercise in writing do not help me, I need to watch them doing them so, I can figer out how to do them, or if I should even try to do them. I use the flex extendors, lifting my legs one at a time from the flor to strengthen my thys, hip and buttox. And I try to remember to do the bridge excerise. I have had 2 total hip replacements , 7 months a part, in 2013. Trying to get stronger with cold weather will be 70 in Feb. Linda

When a muscle contracts, it shortens. Take the biceps for example. Without getting too technical, the biceps are attached at the forearm and shoulder. When your biceps contract, they shorten and bring those two points closer together. When you rest, the muscle returns to its normal length, and the two points move farther away. Constantly contracting your biceps over a long period of time would cause them to get shorter, even at rest.
If you suffer from tight hips, I’ve compiled the best stretches and exercises to help you get the relief you need! Whether your hips are tight from sitting all day or from killing your last workout, these hip flexor stretches should help you get some relief. Tight muscles can potentially be shortened, and tight hips might mean your abs are weak or you have some instability in your back. Let’s stretch these babies out and help you work to get balanced and feeling better!
Extension (as a definition) increases the angle between the bones in a joint.  When you extend your knee, you are straightening your knee from the bent position, increasing the angle between the femur and the shin bones.  When you are extending your hip, your leg is essentially moving backwards in space, say 10-20 degrees.  When you walk, run, or lunge, you have one hip passing through extension.  Now why the fuss about these two words?
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