The Machine
• Arc Alignment - The axis or pivot point of the machine
is positioned posterior to the spine. This creates a down-
ward arc of motion matching spinal flexion and elimi-
nating hip flexion and hip flexor activity.
• Range of Motion - The seat height adjustment allows
for varying torso lengths and serves as a range of
motion limit. Fine tuning of the range of motion can be
made by moving forward or backward slightly on the
seat.
• Resistance Application - The resistance is applied
through an arm pad which is designed to further prevent
hip flexor use.
• Stabilization - A foot plate/strap is not available to
encourage use of the hip flexors. A seat belt is provided to secure the body when the
amount of resistance employed nears the weight of the body. This belt is positioned near
the hip joints to decrease use and leverage of the hip flexors.
• 10 to 205 Pounds by Fives - The top plate provides a minimum weight of ten pounds.
Subsequent plates in the weight stack are twenty pounds each. Three “slide-on” five pound
incremental plates are securely positioned for easy access and effortless addition thereby
providing 10 to 205 pounds in five pound increments.
The Abdominals
• Spinal Flexion - The rectus abdominis is responsi-
ble for flexion and stabilization of the spine. The
internal and external obliques work bilaterally as
synergists in their roles as prime movers for spinal
flexion.
• Range of Motion - Unless a restriction occurs or
is prescribed, range of motion is limited only by
the user’s ability to control the abdominals concen-
trically into full flexion and eccentrically into
hyperextension.
• Associated Muscles - The transverse abdominis is
not situated to assist with spinal flexion. Attempts
at involving this muscle in the crunch by “sucking
in” will decrease the effectiveness of the rectus
abdominis.
CYBEX VR2 Owner’s Manual
MUSCLES TRAINED
Exercise
Page 3-67
Ab Crunch
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