No, because you never know their intentions and they could come to where you live and potentially kidnap or harm you.
Answer:
just drink a lot of water and take a nap if you're not to distracted (;
Support system. your work out partner is supporting you by working out with you.
Answer:
The blood picks up co2 and also waste from the tissue. So I am guessing that it is co2.
Hope this helps.
