This type of squat works the inner part of the thigh well and allows to reduce the load on your back.
Stand up straight. You can take a dumbbell as an additional weight.
Place your feet much wider than shoulder width apart with your toes pointed slightly out.
As you inhale deeply, lower yourself slowly and bend your knees.
You can slightly bend your torso forward but keep your back totally straight. You should move your hip joints only.
When your thighs get parallel to the floor or slightly lower, exhale and straighten your knees and your torso.
Without straightening your knees completely, repeat the exercise.
If you can't squat deeply due to a lack of flexibility or inability to stretch the ankles, do stretching exercises between the sets.