When doing the exercise on the floor with the book, how many seconds should you hold your breath? O4 seconds
5 seconds
O 6 seconds
O 7 seconds

honestly i would say 5 seconds

Explanation:

7 and 6 seconds seems to be a little to long and 4 seconds seems to be short. also when holding your breath its seconds that you can hold it not minutes ( unless you somehow managed that :/ )