ProForm DTL42941 User Manual page 20

HOW TO USE THE UPPER BODY ARMS
As you walk on the treadmill, you can either hold the handrails
or use the upper body arms. To exercise your arms, shoulders,
and back for a total body workout, move the upper body arms
forward and back as you walk on the treadmill.
To vary the intensity of your upper body exercise, the resistance
of the upper body arms can be adjusted. To increase the resis-
tance, turn the resistance knobs clockwise; to decrease the re-
sistance, turn the knobs counterclockwise.
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Upper
Body
Arms
Resistance
Knobs