Final answer:
The leg-stabilization exercise where one stands in front of a box with feet pointed straight ahead is the "step-up". It engages the anterior compartment of the leg and improves balance and stability.
Step-by-step explanation:
The leg-stabilization exercise that involves standing in front of a box or platform with feet pointed straight ahead is called step-ups. This exercise engages muscles responsible for elevating the sole of the foot and bending the inside of the foot upwards, which is crucial for maintaining balance and posture. When performing step-ups, individuals typically start by placing one foot on the elevated surface and pushing through the heel to lift their body up, followed by raising the opposite knee. This exercise can improve muscular balance and stability by targeting the anterior compartment of the leg and other stabilizing muscles.