One study found that subjects performing isometric co-contractions of elbow flexors (bicep ... and hips at full extension. These can be done loaded or using just your body weight.

Main outcome measures Maximal isometric elbow flexion and extension strength were measured bilaterally using a purpose-built standing frame such that gripping was avoided. Results The authors found ...

Objective: To determine if the combined isometric contractions of knee extension/hip adduction and knee extension/hip abduction will elicit a different quadriceps and gluteus medius electromyographic ...