Power-up breathing often surprises people.
Sometimes you do a few rounds and your body wants to tremor / shake / yawn / get teary.
That can be your nervous system discharging stored tension.
Two grounding rules:1) Intensity is optional. Gently is still effective.2) Pain is a stop signal. Discomfort is okay; pain is not.
If you tend to run anxious/overstimulated, do fewer rounds and prioritize a long exhale after.If you tend toward shutdown/freeze, kick it up and this can raise your energy.