Ditto for me, especially on squats. About 8 seconds after my first lift in a set, the lack of oxygen hits me hard: I first yawn and then begin breathing faster.

Ditto for me, especially on squats. About 8 seconds after my first lift in a set, the lack of oxygen hits me hard: I first yawn and then begin breathing faster. This is when going straight into the squats with no warmup whatsoever.