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Question Co2 table question

Thread Status: Hello , There was no answer in this thread for more than 60 days.
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New Member
Apr 15, 2020
Hi, I am doing the following co2 table daily:

breath 2:00, hold 1:20, breath 1:45 hold 1:20 all the way to breath 0:15 hold 1:20 (total 8)

I have a few questions on it:
1) the breathing between holds, should I try to breath normally or is it ok to do recovery breathing in that period?
2) last breath before the hold, should I take as deep as possible , full lungs?
3) sometimes instead of construction I feel like a shivering going through my body, is that normal?
4) I only start to feel the heat in my core around the 7 round, does it mean I should increase the hold time?

thank you to anyone who will contribute from their knowledge