This exercise focuses on the gluteus medius (and also the gluteus minimus) that is responsible for the abduction of the leg and the stability of the hip when walking.
A lot of people have weaknesses of those deep muscles that can lead to pain in the hip.
In this video, you will perform 10 repetitions of 4 exercises while laying down on one side. You will then repeat the same exercises on the other side.
If it feels too painfull for you, just stick with 4 rounds of Level 1, then progress to level 2 the following week ect... And if it is too easy, you can try to do 15 reps or 20 reps of each.
Adapt to yourself!
And don't forget to stretch straight after! It is going to hurt!