With this exercise it is important to maintain an upright posture, use a full length mirror to help with visual feedback. You should slowly abduct your leg for roughly 3 seconds whilst maintaining your balance. Perform 8 reps on each leg.
This exercise will activate your glutes as well as load the hamstring, be sure to drive your opposite forward (as shown in the video) and pause and hold at the top of the movement. Start by doing 2 sets of 8 on each side.