Answer:
muscle imbalance
Explanation:
If this was actually a true statement (whch it is not because football players are very well balanced), the focus on one or two muscle groups willl neglecting others will cause a muscle imbalance.
Flexibility has to do with stretching.
on top of the field dressing .
<span>a hypothetical force formerly held to pervade all nature and to manifest itself in magnetism, mesmerism, chemical action, etc.</span>
Probably the last one. It's the least realistic way to make your body healthy. If you are going to do exercise and make yourself healthy, friends would be helpful in that process and exercising is definitely a good way to be healthy.