Answer:
The state of being healthy and fit is called fitness. Training should be according to the personal fitness goals, commitments and conditioning.
In order, to reach the result the workout and exercise must be challenging over the course this is what the overload principle of fitness states.
In case of over-training, the muscle tissues and fiber can get stretched and pulled. This can cause severe injuries and damage to the body organs.
No they do not. Even if they did, they live in water so. Hope this helps!
