1) Lie on
your back on the floor, your legs across a bench in front of you while
performing the Trunk Flex Exercises.
2) Curl your
shoulders and trunk upward toward your knees. Don't
lift your entire back up off the floor, just roll forward and
crunch your rib cage toward your pelvis.
3) At the top
of the Trunk Flex Exercise movement, give an extra squeeze on the abs muscle in order to
achieve feel the contraction, then release and lower your shoulders back to
the starting position. Don't do the trunk flex exercise in a rush. Do each
abs crunches deliberately and under control.
You may vary
the angle of stress on your abs muscle by raising your foot position.
Instead of putting your legs across a bench, try lying on the floor and
placing the soles of your feet against a wall when doing the Trunk Flex
(Abs Crunches) bodybuilding workout.