Today's exercise is the counter to yesterday's exercise. This involves lifting the lower leg while you lie on you side. It works the hip adductor (the inside of your thigh) instead of the abductor (outside) Because it's crossing the other leg, it won't lift nearly as far as when lifting the higher leg. The supporting muscles are the same as yesterday, the glutes, quadriceps, hamstrings and abdominals.
With the complete exercises from this week, the thigh has been targeted from every side. The abs have also been targeted. This should increase strength and balance.