Can you have seizures from intense exercise or workouts?

Not normally: If you or someone else you know has had what appears to be a first time seizure that warrants urgent medical evaluation.

Seizure v. exercise: Exercise and work outs should not cause a seizure. Perhaps an exception would be ultramarathon. If you were to exercise so much you became dehydrated or ill, or you had a very low blood sugar and diabetes, you could have a seizure. Generally though, exercise cannot cause a seizure. Head injuries however can cause seizures.

You can: However, there is research showing that if patients with a history of epilepsy does regular excercise, there is a significan reduction in the frequency of seizures in patients followed over 25 years

Perhaps: You may have a category of reflex epilepsy, where an activity or stimulus triggers the seizure. Anti epileptic meds can be adjusted to prevent such responses.