Can you train for a heart attack?

OK so say I spent my entire left getting scared the crap out of – people constantly jumping out from cupboards, leaving spiders in baths, pushing me out of bed and so on.

Would my heart be better at dealing with short periods of intense activity? And therefore better equipped to deal with a heart attack?

Obviously there are some drawbacks here, such as turning into a gibbering wreck and being afraid of everything. This would generally make for a pretty shonkey life – but just hypothetically do you think it’s possible?