Your heart rate will go down, causing you to cool down before you are done exercising. This is good because then you won’t have a high heart rate for a long time.
Not sure how this has to do with Health but my answer would be to not buy things online at all. Nowadays it's EXTREMELY easy to get robbed of your money, by people that live across the world. Your bank account can easily be accessed through a phone, computer, gaming system, credit/debit card, check book, etc. I covered things both online and off. Stay safe!