Janu Sirsasana is a yoga pose found in the first series of Ashtanga Yoga and combines en forward bend with a quiet extreme position of the outward going knee and leg.
Usually it puts too much strain on the ball of the foot, especially at the big toe.
Here I explain why this exercise is done: in fact it helps to open the hip and knee and releases tension from the foot - which all assist in preparing the body for more extreme hipopeners.

We can use it as a way to strenghten the outside leg in a deeper way even if you are not interested in doing Janu Sirsasana C.