SLR in crook ("Straight leg raise" Core/quadriceps strengthening, opposite foot standing)

Lie on your back with your legs bent and feet flat on the floor.
Straighten your affected leg out so that it is flat.
Tighten your abdominal and thigh muscles, and lift this leg directly up, keeping the knee completely straight.
Ensure your stationary leg stays still with the knee pointing to the ceiling.
Control the movement as you lower the leg back down onto the floor.