Easy : Calf Correct Foot Position
Foot alignment should be shoulder width apart, you can confirm this by standing either side of a straight line on the floor.
When you take your rear foot back, it should not cross or move away from the midline, your foot should be pointing forward with your heel either flat on the floor, or raised if aiming to develop the stretch.
Your front leg should bend so that when you look down over your knee, you can see the tip of your toes. Lean forward aiming to keep a straight line with your heel, hip and head.