How to avoid showing too much cleavage while working out?

My workout tops are loose and have a slightly big neck. It doesn't look inappropriate when I'm standing upright, but Lord knows what the world can see when I do those dumbbell rows. I feel uncomfortable even though I have a sports bra underneath. Is it common to have that happen for women and should I just get over it? Or do I need to buy tighter tops with higher necklines? Sometimes I feel like it might be coming across wrongly (aka flirting or trashy) when that's not my intention. But I also don't know if it's just a common thing to have happen to ladies when they workout 🤷🏾‍♀️