What happen when your pushed exercise past your limits?

Answer 1

Being pushed to the limits is good for your body it helps your overall endurance abilities. But put to the limits to much or for two long can result in injury or overtraining

Overtraining is when your body has pretty much had enough of training some symptoms of overtraining are extreme muscle fatigue, constant tiredness, muscles in pain, a higher rest heart rate normally 5 or more beats then usual as well as the inability to exercise properly. To get rid of overtraining simply stop training for around two days then slowly start doing light exercises until you feel your ready to start training properly again.