Question

Perhaps you exercise to maintain good health. Maybe you excersise to lose weight. Or maybe you exercise to build muscles and get stronger we excersize for many reasons but no matter why we excerise our body systems work together. The three main body systems that are critical to vigorous exercising include all but one of those listed here that's the

Answer 1

its d

Step-by-step explanation: its kinda obivious

Answer 2

The answer is the integumentary system

Step-by-step explanation:

This is just your first line of defense. It does not have anything to do with exercising, well on the inside(In a sense).