Here at The Active Times, we love to tout the benefits of exercise. From better digestion to clearer skin and even a stronger immune system, the right amount of exercise can do wondrous things for our health, but what about when we overdo it?

While some people have a tough time getting regular exercise, others struggle with overtraining. Most regular exercisers don’t need to worry about overtraining, but those training for major fitness events or spending upwards of five hours a week in the gym are at risk. It’s a thin line between a healthy amount of exercise and a dangerous amount, which can lead to burnout.