Final answer:
Walking or biking to work can positively impact physical fitness through cardiovascular exercise, bone density maintenance, and calorie burning.
Step-by-step explanation:
Choosing to walk or ride your bike to work can positively affect your physical fitness. These activities provide opportunities for cardiovascular exercise which can strengthen your heart and lungs, and improve overall endurance. Additionally, both walking and biking are weight-bearing exercises that can help maintain healthy bone density. These activities also burn calories and can aid in weight management.
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