and after childbirth on a full layer 3 walks for 2 hours, hardly pushing the wheelchair in front of you (through the snow, which utilities did not clean up and through dirt in the summer) + daily fitness with gymnastics and swimming a couple of times a week (continue to follow the diet).

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Fuck my eyes, you’re serious? 2 hours walk after childbirth. And where do you find time for everything other than walking and fitness? Do you see a child in a wheelchair? Who is cooking? Does the laundry control? Where did the power come from? 😉
The explanation is one - you just don't have a child :D In fact, even the best intentions and ambitious plans for non-stop walks break down in the first month after discharge. It is sufficient simply NOT to eat), supporting breastfeeding.