This video demonstrates the isometric contractions of the muscles of the wrist joint for use in assessments of structures causing symptoms in the elbow region
Reference:
Buchholtz. 2016. Elbow Isometrics: Wrist flexion and extension, and grip strength. DHRS. UCT.
2016. Elbow Isometrics: Wrist flexion and extensionand grip strength. http://hdl.handle.net/11427/24784