I get frequent PACs and occasional PSVT during exercise or under great emotional stress. I've asked about it numerous times and I've caught this on three Holter monitors. I keep getting reassurance that these are benign.
My understanding is that extra beats during exertion are a concern only in structural heart defects or coronary disease, as in those cases frequent ectopy might indicate a more serious problem going on. For those with normal hearts, it's not supposedly an issue.
Nothing like a super thumper whilst trying to exercise though, right? lol I know where you're coming from, believe me.
In the absence of structural disease, benign beats are benign whenever you get them. Good luck on your test. Let us know how it turns out