Do a seated knee extension as follows: Sit up straight on a firm chair with your feet flat on the floor. Keeping your toes flexed (toes pointed toward the ceiling), straighten your knee fully.

Rather than continuing to be unsteady, you may want to try some chair ... and control knee extensions, and your glutes, also ...

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 ...