Single Leg Balance - Knee Extension
Straightening the knee is as difficult as you make it. This should be thought of as an active mobility drill to build balance and stability, but mainly to develop hip flexor strength and hamstring mobility on the straightening leg.
Cues:
Shift your weight to one side and slowly raise your knee as high as possible without leaning back
Continue pulling the knee high as you straighten the leg with the toe pointed
Hold the extended position securely before returning to the bent position
Keep the standing leg locked
Mistakes:
Incomplete knee extension - lower the foot in order to get a full lockout and build from here
Leaning back
Bending the standing knee