Do you think about breathing when you squat? It’s important, so you should….
Inhale At The Top. Inhale when you’re ready to Squat, right before you go down. Raise your chest, pinch your shoulder-blades and squeeze the bar. Take a big breath, hold it and then Squat down. Taking this big breath will help you keep your chest up. It prevents your upper-back from rounding which can cause you to lean forward during your Squat.
Hold At The Bottom. Don’t exhale while you Squat down or at the bottom of your Squat. You’ll lose tension in your ribcage and abdomen. Your chest will collapse and your upper-back will round. The bar will move around and cause you to learn forward. All of this decreases strength while putting your spine and joints at risk. Hold your breath on the way down and at the bottom of your Squat.
Exhale At The Top. Squat the weight back up and exhale at the top. You can slowly exhale on the way up against your closed glottis if the weight moves up slowly and the pressure is high. Once you’re at the top, take as many breaths as you want before going back down. Once you’re ready for your next set, raise your chest and arch your upper-back. Then take a big breath, hold it and Squat back down.
Read more https://stronglifts.com/squat/