Ok. I am not very sure if my answer is correct. I suggest to look further into it. But I do believe it is True. Check if others say the same because i am not that sure.
is bad for you and you shouldn't do it
Answer:
didn't put any options. but cross contamination is one
Wll first of all start a little hard to see how much would be the most your friend can do and then go slowly so that the muscle gets used to fast movement but especially with a correct diet that must follow step by step.
I hope this works for you