Instruction: Carefully assess the user's review for any strong expressions of sentiment, either positive or negative. Based on your analysis, select the most fitting sentiment option from the provided list as output.

Input:
I have been having back and leg muscle problems for too many years of sitting for work and for fun (stupid video games).  As a result I have to spend a lot of time stretching -- this strap is great.  Very durable.  Love the loops.  I travel for work and bought a second to leave at my hotel.  I can't comment on the contents of the book, as I have never even opened it.

Options:
A: very positive
B: positive
C: neutral
D: negative
E: very negative
Answer: A: very positive