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Extending the knee joint (often called a straight leg raise) [4] increases the demands of leverage on both hip and spine flexors. It also allows the rectus femoris muscle to contribute, for both the supine straight leg raise and the hanging straight leg raise versions, although the muscle will be in active insufficiency in the latter case.
The knee raise exercise will work the lower abdominals, and can also work the obliques (see abdominal external oblique muscle and abdominal internal oblique muscle) if one twists the torso during the exercise. This version of the knee raise has been praised by fitness communities [who?] for its effectiveness, as working the abdominal muscles.
Major variants: hanging ~ (hanging from a high bar), side ~ (lying on side), knee raise (lying on back, drawing knees to chest). The Russian twist is a type of exercise that is used to work the abdomen muscles by performing a twisting motion on the abdomen.
You passed the test if your back and the back of your lowered thigh is flat against the bed, and your hanging knee is bent at a 90-degree angle off the surface. Photo credit: Trevor Raab
Drive one knee up toward the ceiling. Return it to the floor and then drive the other up. Keep alternating between driving your right and left knees up for either a set period of time or reps.
Men's Health fitness director Ebenezer Samuel, C.S.C.S. demonstrates the proper form for the hanging leg raise, a difficult ab workout exercise.
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).
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