This exercise is called the Single Leg - Foam Pad - Heel to Shin (SL FP Heel to Shin) and it is a fantastic exercise to help you improve your balance. This particular movement incorporates a ton of proprioception and will challenge you to the max. Please make sure that you have the foam pad on a kitchen rug or carpet so it doesn't slide and that you have acces to something to hold onto until you become familiar with the movement. This movement is an advanced movement in the Balance University program and is not recommended for starters. However, don't be afraid to give it shot! You DO NOT need the foam pad to try this movement.
I suggest you do 2-3 sets of 12-15 repititions of this movement to see improvements in your balance.