How to breathe normally during concentration?

[Magnanimous]

Recently started concentration practice, 2 mins daily.

Whenever I try to concentrate on my selected target, I put so much effort into it that I stop breathing. And when I stop breathing obviously I can't maintain my concentration for very long because I need to breathe again. And if I try my best to breathe normally while concentrating, I'm not fully concentrating on my target, which is not getting the most out of the technique.

How do I breathe normally while doing concentration practice? I'm about to enter a very spiritual phase in my life, where after graduation (2 months) I'll spend the next few months + next year doing a lot of spiritual practice, trying to be able to enter a state of presence at will, so I can enjoy it for the rest of my life. Then I'll hopefully move to London to start pickup and dial in on Life Purpose.