ExRx.net > Kinesiology > Articulations > Joint
Bending the joint resulting in a decrease of angle; bringing forearm toward upper arm.
Straightening the joint resulting in an increase of angle; bringing forearm away from upper arm.
Also see Forearm. Mentioned articulations occur during concentric phase of exercise video examples.
Westside Barbell Program
The Surprising Reason our Muscles Get Tired
Workload Adjustment / Rep Performance Calculator
Pump & Burn
Low-Volume, Progressive-Intensity Weight Training
Weight Training Injury Risk Factors