The accompanying photograph shows Al Kovac who is quadriplegic (tetraplegic)
due to a C7 spinal cord injury, doing the wide grip chest press which emphasizes
the frontal chest muscles (such as the Pectorals) that can be particularly
useful for driving and braking, pushing wheelchairs, and pressure relief.
On the other hand, the narrow grip, changes the emphasis
to the triceps.
Consequently, varying the grip-width adjusts the amount
of emphasis placed on the tricep muscles. This enables people with weak and
strong triceps to do this exercise.
Finally, low resistance and rapid reps provide an aerobic
workout, building endurance and the aerobic capacity that people who are quadriplegic
due to a spinal cord injury need to push wheelchairs, or conduct other activities
of daily living.