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Not sure, but if I work out while waiting for the preworkout to take effect warming my body up I don’t have the same side effect with that tension.

I was taking it, waiting 15-20 mins then...

No, if I exercise without the pre workout I don’t have any tightness in my neck.

Might end up doing a checkup to make sure it’s not something it’s stressing, I’ll use it for a few days to be sure...

I guess I would say cramping feeling, it's tight, wouldn't be because of working out since I wait till I feel the caffeine kick in before working out giving it 20-30mins. And yes I stay very hydrated...

Not immediate, about 20-30 minutes after. Doesn't make breathing hard but I'm aware it's tense when lifting since I'm straining my chest. It does sometimes go away while working out though.

Started my weight loss and weight training about a month ago.

Started taking C4 Sport and the only side effect I notice is that my neck gets tense, the front part. Best guess from what I can point...