Pvcs are not, in themselves, dangerous.
What's important is the underlying condition of your heart. If you're healthy, exercise
might actually make the pvcs go away. If, for example, you're having a heart attack
, pvcs are very bad. You need a checkup, if it hasn't already been done. (ps, pvcs always arise in one of the ventricles but then spread to involve the other ventricle in all cases).